Develop Bugs

Cannot connect to mobile network???

Hello, this is really weird. In fact, when I insert the SIM to my Note 2 N7100 and turn it on, it allows me to make emergency call, but I cannot use it to make any others and it doesn't show the carrier name (it shows Emergency call only). And when I try to use it to make normal phone calls, it says that I am not registered to a mobile network. I try to factory reset my phone, but the problem remains. I then try to remove the SIM card, and it says that I need to insert a SIM card (that means that it is not a hardware problem since it recognizes the card). I then try to go to the mobile network setting to try to connect to the network manually, it connects me but it shows me a warning which says that the mobile network service is not available (and the Emergency call only label remains). However, I am sure that this is not the problem of the card neither since when I insert the card to my Moto MB860, I can make calls as usual. So, what is the problem ??? It seems to me that the problem happens spontaneously since it works perfectly until yesterday. And all other wireless function works fine including wifi , Bluetooth and GPS and the only thing goes wrong is 3g and 2g.
Additional information:
ROM: Omega v.16
Carrier: Fido Canada (as you can see)
Thanks.

First of all, check whether you can see the IMEI of the device. If you can see.
1. Contact your network operator and check whether your IMEI is blacklisted or not.
If you cannot see the IMEI
1.Restore the efs and persist backups (if you have one)
2. flash the device again with the modem image (download the firmware of your device from samfirmwares.com, delete everything from the .tar file except modem.bin, and then flash this file to the phone with Odin (you can get Odin and instructions from that site or from here)
2. maybe your nv_data.bin file or /efs directory got corrupted, make a backup of the folder, then simply delete nv_data.bin, it will be recreated for you.
For this, you’ll need root. If you have a root-enabled kernel, you only have to install the Superuser app and Busybox on the phone, download the Android SDK to your PC, install platform-tools in the SDK manager, go to the platform-tools directory and start adb shell.
In the shell, type su, wait for the Superuser prompt to appear on the phone (if it does not appear, open the Superuser app and try executing su again), enable root access for the command. Now go to /efs, copy everything to for example /sdcard/efs, then rm nv_data.bin.
Reflashing the device with a kernel and checking “phone EFS clear” in Odin also works (make sure you made a backup of the EFS folder just in case).
3. you can try changing the CSC: enter *#272*imei# on the phone tab.
Try this . I'm not sure it works. Just give it a try on yourself.
Trying the above mentioned methods could be vulnerable to your phone if it not done properly. So do it carefully. If you have any doubts feel free to ask me or search elsewhere. But, don't blame me for a fully dead phone. I am not at all responsible for any...

Noob 1st post......have had similar problems with koodo CDN
Not gonna give such an in depth suggestion as above.....he's something simple to try.
I live in a dead zone and often my phone ( galaxyAce) will switch to no service. Even after refreshing and selecting network under settings, it says it's connected, but isn't. A simple apk that always fixes the problem for me is Network Signal Booster @ theplaystore

jabrif said:
First of all, check whether you can see the IMEI of the device. If you can see.
1. Contact your network operator and check whether your IMEI is blacklisted or not.
If you cannot see the IMEI
1.Restore the efs and persist backups (if you have one)
2. flash the device again with the modem image (download the firmware of your device from samfirmwares.com, delete everything from the .tar file except modem.bin, and then flash this file to the phone with Odin (you can get Odin and instructions from that site or from here)
2. maybe your nv_data.bin file or /efs directory got corrupted, make a backup of the folder, then simply delete nv_data.bin, it will be recreated for you.
For this, you’ll need root. If you have a root-enabled kernel, you only have to install the Superuser app and Busybox on the phone, download the Android SDK to your PC, install platform-tools in the SDK manager, go to the platform-tools directory and start adb shell.
In the shell, type su, wait for the Superuser prompt to appear on the phone (if it does not appear, open the Superuser app and try executing su again), enable root access for the command. Now go to /efs, copy everything to for example /sdcard/efs, then rm nv_data.bin.
Reflashing the device with a kernel and checking “phone EFS clear” in Odin also works (make sure you made a backup of the EFS folder just in case).
3. you can try changing the CSC: enter *#272*imei# on the phone tab.
Try this . I'm not sure it works. Just give it a try on yourself.
Trying the above mentioned methods could be vulnerable to your phone if it not done properly. So do it carefully. If you have any doubts feel free to ask me or search elsewhere. But, don't blame me for a fully dead phone. I am not at all responsible for any...
Click to expand...
Click to collapse
I tried a simple way which is format everything and flash another ROM but the problem remains.

TRS_80 said:
Noob 1st post......have had similar problems with koodo CDN
Not gonna give such an in depth suggestion as above.....he's something simple to try.
I live in a dead zone and often my phone ( galaxyAce) will switch to no service. Even after refreshing and selecting network under settings, it says it's connected, but isn't. A simple apk that always fixes the problem for me is Network Signal Booster @ theplaystore
Click to expand...
Click to collapse
I don't know that we are in the same situation since at home I often got a good signal and this happened to me only since yesterday.

jabrif said:
First of all, check whether you can see the IMEI of the device. If you can see.
1. Contact your network operator and check whether your IMEI is blacklisted or not.
If you cannot see the IMEI
1.Restore the efs and persist backups (if you have one)
2. flash the device again with the modem image (download the firmware of your device from samfirmwares.com, delete everything from the .tar file except modem.bin, and then flash this file to the phone with Odin (you can get Odin and instructions from that site or from here)
2. maybe your nv_data.bin file or /efs directory got corrupted, make a backup of the folder, then simply delete nv_data.bin, it will be recreated for you.
For this, you’ll need root. If you have a root-enabled kernel, you only have to install the Superuser app and Busybox on the phone, download the Android SDK to your PC, install platform-tools in the SDK manager, go to the platform-tools directory and start adb shell.
In the shell, type su, wait for the Superuser prompt to appear on the phone (if it does not appear, open the Superuser app and try executing su again), enable root access for the command. Now go to /efs, copy everything to for example /sdcard/efs, then rm nv_data.bin.
Reflashing the device with a kernel and checking “phone EFS clear” in Odin also works (make sure you made a backup of the EFS folder just in case).
3. you can try changing the CSC: enter *#272*imei# on the phone tab.
Try this . I'm not sure it works. Just give it a try on yourself.
Trying the above mentioned methods could be vulnerable to your phone if it not done properly. So do it carefully. If you have any doubts feel free to ask me or search elsewhere. But, don't blame me for a fully dead phone. I am not at all responsible for any...
Click to expand...
Click to collapse
Some updates;
- IMEI is checked.
- I do not have any efs backup
- nv_data.bin has been deleted and recreated
- trying to register for the firmware
- My phone is always rooted.

Dan Law 001 said:
Some updates;
- IMEI is checked.
- I do not have any efs backup
- nv_data.bin has been deleted and recreated
- trying to register for the firmware
- My phone is always rooted.
Click to expand...
Click to collapse
Results..??
Sent from my GT-I9001 using xda premium

jabrif said:
Results..??
Sent from my GT-I9001 using xda premium
Click to expand...
Click to collapse
I need to get the firmware first... since I already passed the download quota for today... need to wait until tomorrow...

Mmm... I heard that you mentioned clearing the EFS in your given procedure, but I do not think that I modified that folder... However, about few days ago, since I want to gain better control on the volume on my headphone remotes, I did modify the file called Generic.kl in system/usr/keylayout, but I restore it after since it didn't work. However, I don't think that this modification will trigger something in the efs folder since it has different directory. By the way, I did some research online and they say that the efs contains information about the carrier on the phone, so will there's a greater chance that the problem is caused by the possible modification on the efs than any other factor and will there also something else that possibly trigger the similar effects?
Sent from my GT-N7100 using xda premium

Still nothing

[Tools][How-To][Guides] Backup & Restore EFS + Get out from Permanent Safe mode

Note to forum managers: Please make it a Sticky Thread, It should help to all users and there is no use for this tutorial if it is in page 3
Hello XDA Users,
I think some people here know who I am, so I will jump on the "Introduction of myself" for now.
Recently, I have faced many questions & problem of fake IMEI, of damaged EFS folder. So I made a little experiment on my device(GN2).
First, I backuped my EFS folder in 2 types - one is .img and the second is tar.gz.
Then, I deleted my EFS folder using ES Root Explorer. Which made my device to be on somethine called "Permanent Safe Mode" - You can not get out untill you fix your EFS folder and change some values.
This is permanent safe mode:
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
After I did my "research" I have managed to make several methods to backup & restore EFS, which should make your life easier and better.
First of all, Disclaimer:
I'm not responsible for any damage caused by using these methods, all methods tested by me, so it should work on your device too.
This is for I9500 Only!!!!!!!
Let's continue.
What you must have:
Latest base with latest modem and latest kernel - very important since in the latest versions samsung prevented the option to install old modems/kernels, so if you install old kernell/modem it can show you wrong IMEI.
Rooted device with the latest Super User
Latest busybox
CWM / PhilZ Recovery
Terminal Emulator
Root explorer - Can be ES File Explorer with working root option or just a root explorer from the market
A working EFS backup(In order to restore it...)
Time & Patient.
Important Notes:
When installing XWUBMG5, several people suffered from Fake IMEI. This is because the new firmware messed up your EFS folder, which means that you can not restore EFS backup until you are on older version, recommended is XXUBMG9(right to 05/08/2013)
Some custom roms include modem installation in their rom installer. Due to modem flashing in recovery, some devices might get Fake IMEI. My recommendation is before even starting to use this guide, please try to install the latest modem via odin from this thread:
http://forum.xda-developers.com/showthread.php?t=2192025
You will find at least one method that works on your device, so don't give up after one method.
Note II & S4 has the same EFS partition (mmcblk0p3), All methods were checked by me on my Note II and fully work. So it should work on S4 too. At least 90% of them
Read all guide and pay attention to all small details.
Backup methods
Method 1 - .img backup
First method, is an automatic backup/restore software.
Special thanks to A.S._id for his software.
Original thread:
http://forum.xda-developers.com/showthread.php?t=2430177&nocache=1&styleid=19
The software:
A.S._id said:
SAMSUNG_I9500_EFS_BACKUP_RESTORE_AUTOMATIC
Instructions:
! Need for backup Root access, debugging USB and busybox
1. Extract from the zip and run. Bat file
2. Is okay to your PC and follow the menu
Automatically create a text file of all the parameters of the device at the time of the copy
Automatic backup of efs:
* Odin flash file. Tar.md5,
* raw.img
* Tar.gz archive
Automatic naming of files and backup archive version of the firmware
Restore to choose from archives and backup images
Automatic start of Odin and the transition to the flashing mode when selecting Odin Restore
DOWNLOAD
Thanks to:
shoma_81, tester99,
For help and assist in the creation of tool
p.s. * Deposit assured recovery - to have the device firmware version corresponding to the backup copy
Click to expand...
Click to collapse
Method 2 - .img backup
Method number 2 will create you efs.img backup on your internal sd. After that you can copy it to your computer.
What you have to do is this:
Open terminal emulator
Write the following:
Code:
su
Then click enter. It will ask for super user permission, give it permissions.
Then write:
Code:
dd if=/dev/block/mmcblk0p3 of=/sdcard/efs.img bs=4096
Then click enter.
When it finishes, check if you have efs.img on your phone memory. If so, copy it to comupter, if not, you did something wrong try again.
Click to expand...
Click to collapse
Method 3 - .tar.gz backup
This method will compress your efs folder into tar.gz file. This method is the same as choosing backup EFS folder in my rom(PhoeniX ROM)/Omega/Wanam/etc.
A tar.gz backup should look like this(On some devices there might be more files, but this picture was taken from Note II N7100 backup and it fully works):
What you have to do is this:
Download this and copy it to your device:
http://d-h.st/f4I
Reboot into recovery
Flash the zip
Reboot your device.
Connect your device to your pc, and copy the backup in "efs_backup" folder.
Click to expand...
Click to collapse
Restore methods
Now the fun begins
You will have to restore your backup when you have one or more of the folowing problem:
Fake IMEI (usually 004999010640000) or "null" IMEI
Blinking SIM card icon on the top tray… ETC
Unable to unlock your SIM card using your PIN
Fake Serial Number (usually 0000000) or "null" Serial
Unable to register to the network (usually comes with Fake IMEI & Fake Serial so check them.)
Attention please,
If you are 100% that your EFS folder is damaged and you have a working EFS backup with the right IMEI number, my recommendation is this:
With root explorer, go to your efs folder and delete all files inside
Long press on power button will turn off your device.
Then turn on the device, you will be in "Permanent Safe Mode".
Continue to one of the following methods.
Click to expand...
Click to collapse
Method 1 - restore .img backup
First method, is an automatic backup/restore software.
Special thanks to A.S._id for his software.
Original thread:
http://forum.xda-developers.com/showthread.php?t=2430177&nocache=1&styleid=19
The software:
A.S._id said:
SAMSUNG_I9500_EFS_BACKUP_RESTORE_AUTOMATIC
Instructions:
! Need for backup Root access, debugging USB and busybox
1. Extract from the zip and run. Bat file
2. Is okay to your PC and follow the menu
Automatically create a text file of all the parameters of the device at the time of the copy
Automatic backup of efs:
* Odin flash file. Tar.md5,
* raw.img
* Tar.gz archive
Automatic naming of files and backup archive version of the firmware
Restore to choose from archives and backup images
Automatic start of Odin and the transition to the flashing mode when selecting Odin Restore
DOWNLOAD
Thanks to:
shoma_81, tester99,
For help and assist in the creation of tool
p.s. * Deposit assured recovery - to have the device firmware version corresponding to the backup copy
Click to expand...
Click to collapse
Method 2 - Restore .img backup
Method number 2 will restore your efs.img backup from your internal sd.
What you have to do is this:
Put your efs.img on your phone memory(not external sd card!) in the main memory, not inside folder.
Open terminal emulator
Write the following:
Code:
su
Then click enter. It will ask for super user permission, give it permissions.
Then write:
Code:
dd if=/sdcard/efs.img of=/dev/block/mmcblk0p3 bs=4096
Then click enter.
Now, reboot your device. If you still don't have IMEI/You are still in Safe Mod, reboot again.
In the second reboot, the bootanimation might stuck and the device will reboot automatically again. Don't worry, it is ok because it installs your efs.img.
Click to expand...
Click to collapse
Method 3 - restore .tar.gz backup
This method will restore .tar.gz backup.
A tar.gz backup should look like this(On some devices there might be more files, but this picture was taken from Note II N7100 backup and it fully works):
If you have like this, continue to the guide:
Create on your Phone Memory(Not Extrenal sd!!) a folder called "efsbackup"(without quotes)
Copy all files & folders from the EFS backup into "efsbackup" folder(The files are like in the picture)
Download this script & copy it to your device:
http://d-h.st/XcL
Reboot into recovery
Go to mount section and click on(Very important!):
Mount /efs
Click to expand...
Click to collapse
Now install the script you have downloaded.
After it finishes, reboot.
Now everything should be fixed, of course if your backup is 100% ok.
If it doesn't work, try method 4.
Click to expand...
Click to collapse
Method 4 - restore .tar.gz backup
This method will restore .tar.gz backup.
A tar.gz backup should look like this(On some devices there might be more files, but this picture was taked from Note II N7100 backup and it fully works):
If you have like this, continue to the guide:
Create on your Phone Memory(Not Extrenal sd!!) a folder called "efsbackup"(without quotes)
Copy all files & folders from the EFS backup into "efsbackup" folder(The files are like in the picture)
Using root explorer, go to "efsbackup folder, select all files & folders there, and click Copy.
Still in root explorer, go to "efs" folder of your device(It is located where all main folders like data, system, etc.).
In "efs" folder, click paste. It will ask you if you want to replace your files, select replace to all files(So all your files from "efsbackup" folder will be in "efs" folder)
Now open terminal emulator
Write the following:
Code:
su
Then click enter. It will ask for super user permission, give it permissions.
Now write:
Code:
busybox chown 1001:1001 /efs/nv_data.bin
Then click enter.
Now write:
Code:
busybox chmod 06755 /efs/nv_data.bin
Then click enter.
Reboot device. Now everything should work.
Click to expand...
Click to collapse
Exit "Permanent Safe Mode"
When you in "Permanent Safe Mode" situation, it means that your EFS folder is broken.
If you succeeded in restoring your IMEI and you still stuck in this Safe Mode, use this guide:
Method 1
Open root explorer.
Navigate to /efs/FactoryApp/
Open "factorymode" file as Text and edit it:
Change this:
Code:
OFF
To:
Code:
ON
Open "keystr" file as Text and edit it:
Change this:
Code:
OFF
To:
Code:
ON
Reboot device.
Click to expand...
Click to collapse
Method 2
Open Terminal emulator
Write the following:
Code:
su
Then click enter. It will ask for super user permission, give it permissions.
Write the following & click enter:
Code:
rm /efs/FactoryApp/keystr
Write the following & click enter:
Code:
rm /efs/FactoryApp/factorymode
Write the following & click enter:
Code:
echo -n ON >> /efs/FactoryApp/keystr
Write the following & click enter:
Code:
echo -n ON >> /efs/FactoryApp/factorymode
Write the following & click enter:
Code:
chown 1000.1000 /efs/FactoryApp/keystr
Write the following & click enter:
Code:
chown 1000.1000 /efs/FactoryApp/factorymode
Write the following & click enter:
Code:
chmod 0744 /efs/FactoryApp/keystr
Write the following & click enter:
Code:
chmod 0744 /efs/FactoryApp/factorymode
Reboot your device
Click to expand...
Click to collapse
This is all I can do for you friends, Worked alot on these methods to give you the best information.
Each method was tested by me and fully works.
If this helped you please press the "Thanks" button.
If you like & appreciate my work please consider a donation!
Credits:
shnizlon
Candanga
A.S._id
dhiru1602
UtkarshGupta
P.M If you think that I forgot you
XDA:DevDB Information
Backup & Restore EFS + Get out from Permanent Safe mode I9500, a Tool/Utility for the Samsung Galaxy S 4
Contributors
tamirda
Version Information
Status: Stable
Created 2013-09-05
Last Updated 2013-09-05

Awesome my friend 5 stars hit, I will link you in my post.
I hope people read in detail and take precautions
Hugs
Sent from my GT-I9500

Crash 1976 said:
Awesome my friend 5 stars hit, I will link you in my post.
I hope people read in detail and take precautions
Hugs
Sent from my GT-I9500
Click to expand...
Click to collapse
Thank you my friend,
In my note II I did like 20 backups before I deleted my EFS folder around 20 times ahah.
People should be aware that samsung is trying to mess up our devices.

Thank you Tarmida, This is the best userful topic ever for my S4 :good:. This will saving many lives of XDA member :good:

Excellent my friend tamirda! :good:
regards!
5 stars! and sticky please!

great topic and guide tamir.5 stars from me :thumbup: will help me a lot if i get stuck with any prob like before arghhhh
Sent from my GT-N7000 using Tapatalk 2

galza said:
great topic and guide tamir.5 stars from me :thumbup: will help me a lot if i get stuck with any prob like before arghhhh
Sent from my GT-N7000 using Tapatalk 2
Click to expand...
Click to collapse
I am happy to help you any time
» Arrow « said:
Excellent my friend tamirda! :good:
regards!
5 stars! and sticky please!
Click to expand...
Click to collapse
Thank you friend!
bafknight said:
Thank you Tarmida, This is the best userful topic ever for my S4 :good:. This will saving many lives of XDA member :good:
Click to expand...
Click to collapse
Thank you friend, and yes this can be very useful for alot of users.
Sent from my GT-N7100 using xda app-developers app

@tamirda
Hi I'm using crash rom 5.5
I made full wipe and flash MG5
By odin and now I have fake imei
I restore crash rom 5.5 backup from cwm and the problem still exsist
I don't make EFS backup before
How to fix it ?
Sent From my i9500 With Crash Rom
--------------------------------
ادعوا لي بالتوفيق في امتحاناتي
wish me good luck for my exams

AL_IRAQI said:
@tamirda
Hi I'm using crash rom 5.5
I made full wipe and flash MG5
By odin and now I have fake imei
I restore crash rom 5.5 backup from cwm and the problem still exsist
I don't make EFS backup before
How to fix it ?
Sent From my i9500 With Crash Rom
--------------------------------
ادعوا لي بالتوفيق في امتحاناتي
wish me good luck for my exams
Click to expand...
Click to collapse
Hello,
It seems that crash backuped your Fake IMEI.
Something that I thing it might help, helped for some other, download latest modem from here:
http://forum.xda-developers.com/showthread.php?t=2192025
install it as a Phone in Odin.
it is importand to mark phone, and flash via odin.
Then try..
If you don't have any other backup, I think you might have to use your warranty.

When I backup the rom I forget my phone in flight mode maybe this the reason why I lost my imei ?
And my baseband now is
I9500DDUBMF8
+Edit
I found these in my internal storage
The First One From Crash Rom 5.0
And The Second From Stock MG5 Where I have fake imei
Sent From my i9500 With Crash Rom
--------------------------------
ادعوا لي بالتوفيق في امتحاناتي
wish me good luck for my exams

AL_IRAQI said:
When I backup the rom I forget my phone in flight mode maybe this the reason why I lost my imei ?
And my baseband now is
I9500DDUBMF8
Sent From my i9500 With Crash Rom
--------------------------------
ادعوا لي بالتوفيق في امتحاناتي
wish me good luck for my exams
Click to expand...
Click to collapse
I don't think there is connection between these two.
Downlaod this:
http://d-h.st/esG
Open odin, Select Phone, select the modem's tar, connect phoen and flash.
After that check if you have IMEI.
If not, Try to install stock XXUBMG9 or XXUBMG5 - If you had MG5 before, it seems that you can not downgrade your phone, so try to install MG5.
If after MG5 there is still no IMEI,
Flash again as Phone via odin this modem:
http://d-h.st/Xxk
If still there is no IMEI, try to restore your current EFS backup.(Make sure you have Root and busybox and all I asked in the main thread)
If after that no IMEI,
Restore to stock and use warranty( make a story that you woke up one morning and you couldn't conect to your network, and you tried to mnake factory reset and still it didn't help)
Good luck

tamirda said:
I don't think there is connection between these two.
Downlaod this:
http://d-h.st/esG
Open odin, Select Phone, select the modem's tar, connect phoen and flash.
After that check if you have IMEI.
If not, Try to install stock XXUBMG9 or XXUBMG5 - If you had MG5 before, it seems that you can not downgrade your phone, so try to install MG5.
If after MG5 there is still no IMEI,
Flash again as Phone via odin this modem:
http://d-h.st/Xxk
If still there is no IMEI, try to restore your current EFS backup.(Make sure you have Root and busybox and all I asked in the main thread)
If after that no IMEI,
Restore to stock and use warranty( make a story that you woke up one morning and you couldn't conect to your network, and you tried to mnake factory reset and still it didn't help)
Good luck
Click to expand...
Click to collapse
Thanks I'll Try These Method
If not working I'll use my warranty
EDIT
I directly flash I9500_UBUBMG9_MODEM
And know it's work fine with me
I Should Try it before ask sorry for that
this is the first time I have this problem
Thank you very much
Sent From my i9500 With Crash Rom

AL_IRAQI said:
Thanks I'll Try These Method
If not working I'll use my warranty
EDIT
I directly flash I9500_UBUBMG9_MODEM
And know it's work fine with me
I Should Try it before ask sorry for that
this is the first time I have this problem
Thank you very much
Sent From my i9500 With Crash Rom
Click to expand...
Click to collapse
Hi mate,
First of all,
I am more than happy that I helped you.
Second, this is ok to ask questions, that is why I am here.
Now backup at leat 5 times your EFS .img & tar.gz.
Enjoy!

tamirda said:
Hi mate,
First of all,
I am more than happy that I helped you.
Second, this is ok to ask questions, that is why I am here.
Now backup at leat 5 times your EFS .img & tar.gz.
Enjoy!
Click to expand...
Click to collapse
I backup 3 times with every method
Thanks
Sent From my i9500 With Crash Rom
--------------------------------
ادعوا لي بالتوفيق في امتحاناتي
wish me good luck for my exams

Awesome guide.
Burned up whole weekend over the issue and now fixed my issue following the guide.
Cannot thank you enough man!
Regards,
Pdash

pdash79 said:
Awesome guide.
Burned up whole weekend over the issue and now fixed my issue following the guide.
Cannot thank you enough man!
Regards,
Pdash
Click to expand...
Click to collapse
I am happy to help & hear that you succeed in restoring IMEI.
Sent from my GT-N7100 using xda app-developers app

I read your post, all most the method use terminal emulator, so what is that ?, and can you give me link of that ?
thanks you very much

daogiahieu said:
I read your post, all most the method use terminal emulator, so what is that ?, and can you give me link of that ?
thanks you very much
Click to expand...
Click to collapse
Linux command line shell on Android. Here's it, mate https://play.google.com/store/apps/details?id=jackpal.androidterm&hl=vi

Thanxs @tamirda
I could see everyday a new post related to messed up EFS folder.
It would surely help people out
Anyhow i had already backed up mine using the EFS professional Software. Is it enough or should i backup using your methods also?

manu44 said:
Thanxs @tamirda
I could see everyday a new post related to messed up EFS folder.
It would surely help people out
Anyhow i had already backed up mine using the EFS professional Software. Is it enough or should i backup using your methods also?
Click to expand...
Click to collapse
I think it is enough, depands on your feeling

[tool] SAMSUNG_I9500_EFS_BACKUP_RESTORE_AUTOMATIC

SAMSUNG_I9500_EFS_BACKUP_RESTORE_AUTOMATIC
Instructions:
! Need for backup Root access, debugging USB and busybox
1. Extract from the zip and run. Bat file
2. Is okay to your PC and follow the menu
Automatically create a text file of all the parameters of the device at the time of the copy
Automatic backup of efs:
* Odin flash file. Tar.md5,
* raw.img
* Tar.gz archive
Automatic naming of files and backup archive version of the firmware
Restore to choose from archives and backup images
Automatic start of Odin and the transition to the flashing mode when selecting Odin Restore
DOWNLOAD
Thanks to:
shoma_81, tester99,
For help and assist in the creation of tool
p.s. * Deposit assured recovery - to have the device firmware version corresponding to the backup copy

A.S._id said:
SAMSUNG_I9500_EFS_BACKUP_RESTORE_AUTOMATIC
Click to expand...
Click to collapse
Thanks for the tool!
One question: is it device-specific (i9500) or can we use it on other Galaxy devices (I have i9305)?

I used this tool to backup the EFS and later on after flashing a custom ROM when i restored the backup i didn't get back to Service and the IMEI Was still NULL

A.S._id said:
SAMSUNG_I9500_EFS_BACKUP_RESTORE_AUTOMATIC
Instructions:
! Need for backup Root access, debugging USB and busybox
1. Extract from the zip and run. Bat file
2. Is okay to your PC and follow the menu
Automatically create a text file of all the parameters of the device at the time of the copy
Automatic backup of efs:
* Odin flash file. Tar.md5,
* raw.img
* Tar.gz archive
Automatic naming of files and backup archive version of the firmware
Restore to choose from archives and backup images
Automatic start of Odin and the transition to the flashing mode when selecting Odin Restore
DOWNLOAD
Thanks to:
shoma_81, tester99,
For help and assist in the creation of tool
p.s. * Deposit assured recovery - to have the device firmware version corresponding to the backup copy
Click to expand...
Click to collapse
Hi , i really need ur help , i backed up my imei with this tool but i only got efs.img file and now i lost my imei and i cant restore my original imei ,the file size is about 10mb can i give u the file to edit it for me so i can flash it with odin .........

@A.S._id
I lost my IMEI after installation a rom.
I have a file like efs_08Feb2017-0609.tar.gz because of the rom make it when installation.
If i want to use your tool. What folder should i give that file to ?

can someone share their efs back up?

Hello efs is not downloading wc site can i use pliz help

eellrraawwii said:
Hi , i really need ur help , i backed up my imei with this tool but i only got efs.img file and now i lost my imei and i cant restore my original imei ,the file size is about 10mb can i give u the file to edit it for me so i can flash it with odin .........
Click to expand...
Click to collapse
just use the 7z program to put the efs.img in the tar file that you will create
- when installed click on efs file with right mouse , click on 7z then add to archive . a menu will appear select the " tar " extension and press ok
- in odin program click in the section CP choose your file you have created and press ok then start :good:

Lost IMEI - Kindly help
kapmino269 said:
Or use z3x and return to samung rom(need chainfire root) and repair your data and take backup with twrp on extsdcard and then flash your custom rom
Click to expand...
Click to collapse
Hi
I am using SM-N9500 samsung note 8 model, i frequently change the roms.. but last time i tried to install a custom rom and then i lost IMEI. i am getting error like IMEI-unknown, baseband- unknown, no network and sim cards not working..
i tried installing stock rom, custom roms, it was installing successfully but IMEI is not working. i didnt even back up my EFS folder. So, kindly help me to get back my IMEI.
Build number - R16NW.N9500ZHS4CRJ1

[Tools][How-To][Guides] Backup & Restore EFS + Get out from Permanent Safe mode

Note to forum managers: Please make it a Sticky Thread, It should help to all users and there is no use for this tutorial if it is in page 3
Hello XDA Users,
I think some people here know who I am, so I will jump on the "Introduction of myself" for now.
Recently, I have faced many questions & problem of fake IMEI, of damaged EFS folder. So I made a little experiment on my device(GN2).
First, I backuped my EFS folder in 2 types - one is .img and the second is tar.gz.
Then, I deleted my EFS folder using ES Root Explorer. Which made my device to be on somethine called "Permanent Safe Mode" - You can not get out untill you fix your EFS folder and change some values.
This is permanent safe mode:
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
After I did my "research" I have managed to make several methods to backup & restore EFS, which should make your life easier and better.
First of all, Disclaimer:
I'm not responsible for any damage caused by using these methods, all methods tested by me, so it should work on your device too.
This is for I9505 Only!!!!!!!
Let's continue.
What you must have:
Latest base with latest modem and latest kernel - very important since in the latest versions samsung prevented the option to install old modems/kernels, so if you install old kernell/modem it can show you wrong IMEI.
Rooted device with the latest Super User
Latest busybox
PhilZ Recovery
Terminal Emulator
Root explorer - Can be ES File Explorer with working root option or just a root explorer from the market
A working EFS backup(In order to restore it...)
Time & Patient.
Important Notes:
When installing/downgrading firmwares, several people suffered from Fake IMEI. This is because the new firmware messed up your EFS folder, which means that you can not restore EFS backup until you are on the latest version, latest modem and latest stock kernel, recommended is XXUBMH1(right to 05/09/2013)
Some custom roms include modem installation in their rom installer. Due to modem flashing in recovery, some devices might get Fake IMEI. My recommendation is before even starting to use this guide, please try to install the latest modem via odin from this thread:
http://forum.xda-developers.com/showthread.php?t=2192025
When installing modem via odin, make sure you select PHONE and not PDA
You will find at least one method that works on your device, so don't give up after one method.
Read all guide and pay attention to all small details.
Backup methods
Method 1 - .img backup
First method, is an automatic backup/restore software.
Special thanks to A.S._id for his software.
The software:
I9505 EFS Backup / Restore
Help to preserve and restore the image of EFS partition:
* Need Root
For Windows
* Extract from the archive, connect the device to the USB debugging mode (System settings/Developer options/USB debugging) and run selected .bat (depending on the backup or restore)
* To retain the image of efs.img must be in a folder with Restore_EFS.bat
* Extract from the archive, connect the device to the USB debugging mode (System settings/Developer options/USB debugging) and run RUN_ME into terminal (double click), select option...
What is EFS, Why it is necessary to backup
Click to expand...
Click to collapse
Method 2 - .img backup
Method number 2 will create you efs.img backup on your internal sd. After that you can copy it to your computer.
What you have to do is this:
Open terminal emulator
Write the following:
Code:
su
Then click enter. It will ask for super user permission, give it permissions.
Then write:
Code:
dd if=/dev/block/mmcblk0p10 of=/sdcard/efs.img bs=4096
Then click enter.
When it finishes, check if you have efs.img on your phone memory. If so, copy it to comupter, if not, you did something wrong try again.
Click to expand...
Click to collapse
Method 3 - .tar.gz backup
This method will compress your efs folder into tar.gz file. This method is the same as choosing backup EFS folder in my rom(PhoeniX ROM)/Omega/Wanam/etc.
A tar.gz backup should look like this(On some devices there might be more files, but this picture was taken from Note II N7100 backup and it fully works):
What you have to do is this:
Download this and copy it to your device:
http://d-h.st/SaK
Reboot into recovery
Flash the zip
Reboot your device.
Connect your device to your pc, and copy the backup in "efs_backup" folder.
Click to expand...
Click to collapse
Restore methods
Now the fun begins
You will have to restore your backup when you have one or more of the folowing problem:
Fake IMEI (usually 004999010640000) or "null" IMEI
Blinking SIM card icon on the top tray… ETC
Unable to unlock your SIM card using your PIN
Fake Serial Number (usually 0000000) or "null" Serial
Unable to register to the network (usually comes with Fake IMEI & Fake Serial so check them.)
Attention please,
If you are 100% that your EFS folder is damaged and you have a working EFS backup with the right IMEI number, my recommendation is this:
With root explorer, go to your efs folder and delete all files inside
Long press on power button will turn off your device.
Then turn on the device, you will be in "Permanent Safe Mode".
Continue to one of the following methods.
Click to expand...
Click to collapse
Method 1 - restore .img backup
First method, is an automatic backup/restore software.
Special thanks to A.S._id for his software.
The software:
I9505 EFS Backup / Restore
Help to preserve and restore the image of EFS partition:
* Need Root
For Windows
* Extract from the archive, connect the device to the USB debugging mode (System settings/Developer options/USB debugging) and run selected .bat (depending on the backup or restore)
* To retain the image of efs.img must be in a folder with Restore_EFS.bat
* Extract from the archive, connect the device to the USB debugging mode (System settings/Developer options/USB debugging) and run RUN_ME into terminal (double click), select option...
What is EFS, Why it is necessary to backup
Click to expand...
Click to collapse
Method 2 - Restore .img backup
Method number 2 will restore your efs.img backup from your internal sd.
What you have to do is this:
Put your efs.img on your phone memory(not external sd card!) in the main memory, not inside folder.
Open terminal emulator
Write the following:
Code:
su
Then click enter. It will ask for super user permission, give it permissions.
Then write:
Code:
dd if=/sdcard/efs.img of=/dev/block/mmcblk0p10 bs=4096
Then click enter.
Now, reboot your device. If you still don't have IMEI/You are still in Safe Mod, reboot again.
In the second reboot, the bootanimation might stuck and the device will reboot automatically again. Don't worry, it is ok because it installs your efs.img.
Click to expand...
Click to collapse
Method 3 - restore .tar.gz backup
This method will restore .tar.gz backup.
A tar.gz backup should look like this(On some devices there might be more files, but this picture was taken from Note II N7100 backup and it fully works):
If you have like this, continue to the guide:
Create on your Phone Memory(Not Extrenal sd!!) a folder called "efsbackup"(without quotes)
Copy all files & folders from the EFS backup into "efsbackup" folder(The files are like in the picture)
Download this script & copy it to your device:
http://d-h.st/zwR
Reboot into recovery
Go to mount section and click on(Very important!):
Mount /efs
Click to expand...
Click to collapse
Now install the script you have downloaded.
After it finishes, reboot.
Now everything should be fixed, of course if your backup is 100% ok.
If it doesn't work, try method 4.
Click to expand...
Click to collapse
Method 4 - restore .tar.gz backup
This method will restore .tar.gz backup.
A tar.gz backup should look like this(On some devices there might be more files, but this picture was taked from Note II N7100 backup and it fully works):
If you have like this, continue to the guide:
Create on your Phone Memory(Not Extrenal sd!!) a folder called "efsbackup"(without quotes)
Copy all files & folders from the EFS backup into "efsbackup" folder(The files are like in the picture)
Using root explorer, go to "efsbackup folder, select all files & folders there, and click Copy.
Still in root explorer, go to "efs" folder of your device(It is located where all main folders like data, system, etc.).
In "efs" folder, click paste. It will ask you if you want to replace your files, select replace to all files(So all your files from "efsbackup" folder will be in "efs" folder)
Now open terminal emulator
Write the following:
Code:
su
Then click enter. It will ask for super user permission, give it permissions.
Now write:
Code:
busybox chown 1001:1001 /efs/nv_data.bin
Then click enter.
Now write:
Code:
busybox chmod 06755 /efs/nv_data.bin
Then click enter.
Reboot device. Now everything should work.
Click to expand...
Click to collapse
Exit "Permanent Safe Mode"
When you in "Permanent Safe Mode" situation, it means that your EFS folder is broken.
If you succeeded in restoring your IMEI and you still stuck in this Safe Mode, use this guide:
Method 1
Open root explorer.
Navigate to /efs/FactoryApp/
Open "factorymode" file as Text and edit it:
Change this:
Code:
OFF
To:
Code:
ON
Open "keystr" file as Text and edit it:
Change this:
Code:
OFF
To:
Code:
ON
Reboot device.
Click to expand...
Click to collapse
Method 2
Open Terminal emulator
Write the following:
Code:
su
Then click enter. It will ask for super user permission, give it permissions.
Write the following & click enter:
Code:
rm /efs/FactoryApp/keystr
Write the following & click enter:
Code:
rm /efs/FactoryApp/factorymode
Write the following & click enter:
Code:
echo -n ON >> /efs/FactoryApp/keystr
Write the following & click enter:
Code:
echo -n ON >> /efs/FactoryApp/factorymode
Write the following & click enter:
Code:
chown 1000.1000 /efs/FactoryApp/keystr
Write the following & click enter:
Code:
chown 1000.1000 /efs/FactoryApp/factorymode
Write the following & click enter:
Code:
chmod 0744 /efs/FactoryApp/keystr
Write the following & click enter:
Code:
chmod 0744 /efs/FactoryApp/factorymode
Reboot your device
Click to expand...
Click to collapse
This is all I can do for you friends, Worked alot on these methods to give you the best information.
Each method was tested by me and fully works.
If this helped you please press the "Thanks" button & Rate this thread 5 Stars.
If you like & appreciate my work please consider a donation!
Credits:
shnizlon
Candanga
A.S._id
dhiru1602
UtkarshGupta
P.M If you think that I forgot you
XDA:DevDB Information
Backup & Restore EFS + Get out from Permanent Safe mode - I9505, a Tool/Utility for the Samsung Galaxy S 4
Contributors
tamirda
Version Information
Status: Stable
Created 2013-09-05
Last Updated 2013-09-05

Amm i guess no one need it?

they do need it and i for one would like to thank you for the guide and time and effort in sharing ..mods and fixes are always welcome on xda thanks man:thumbup::thumbup:
Sent from my GT-I9505 using XDA Premium 4 mobile app

port76 said:
they do need it and i for one would like to thank you for the guide and time and effort in sharing ..mods and fixes are always welcome on xda thanks man:thumbup::thumbup:
Sent from my GT-I9505 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
Thanks first real comment in the thread
Sent from my GT-N7100 boosted by PhoeniX ROM

:thumbup:its ok any time my friend ....iv told my friends about the fix and I'm sure they will pop into this very useful and informative thread .. Thanks again iv added it to my subscribed topics and I'm sure people will be popping in to view and post on the thread thanks :thumbup::thumbup:
Sent from my GT-I9505 using XDA Premium 4 mobile app

Nice guide, the command line is the best! :good:

Will heimdall work as an alternative to restore the efs.img? Like this: heimdall flash --efs efs.img ?
It is used from download mode, like odin, so would work even if you cannot boot.

This Method, in Moto x?
tamirda said:
Note to forum managers: Please make it a Sticky Thread, It should help to all users and there is no use for this tutorial if it is in page 3
Hello XDA Users,
I think some people here know who I am, so I will jump on the "Introduction of myself" for now.
Recently, I have faced many questions & problem of fake IMEI, of damaged EFS folder. So I made a little experiment on my device(GN2).
First, I backuped my EFS folder in 2 types - one is .img and the second is tar.gz.
Then, I deleted my EFS folder using ES Root Explorer. Which made my device to be on somethine called "Permanent Safe Mode" - You can not get out untill you fix your EFS folder and change some values.
This is permanent safe mode:
After I did my "research" I have managed to make several methods to backup & restore EFS, which should make your life easier and better.
First of all, Disclaimer:
I'm not responsible for any damage caused by using these methods, all methods tested by me, so it should work on your device too.
This is for I9505 Only!!!!!!!
Let's continue.
What you must have:
Latest base with latest modem and latest kernel - very important since in the latest versions samsung prevented the option to install old modems/kernels, so if you install old kernell/modem it can show you wrong IMEI.
Rooted device with the latest Super User
Latest busybox
PhilZ Recovery
Terminal Emulator
Root explorer - Can be ES File Explorer with working root option or just a root explorer from the market
A working EFS backup(In order to restore it...)
Time & Patient.
Important Notes:
When installing/downgrading firmwares, several people suffered from Fake IMEI. This is because the new firmware messed up your EFS folder, which means that you can not restore EFS backup until you are on the latest version, latest modem and latest stock kernel, recommended is XXUBMH1(right to 05/09/2013)
Some custom roms include modem installation in their rom installer. Due to modem flashing in recovery, some devices might get Fake IMEI. My recommendation is before even starting to use this guide, please try to install the latest modem via odin from this thread:
http://forum.xda-developers.com/showthread.php?t=2192025
When installing modem via odin, make sure you select PHONE and not PDA
You will find at least one method that works on your device, so don't give up after one method.
Read all guide and pay attention to all small details.
Backup methods
Method 1 - .img backup
First method, is an automatic backup/restore software.
Special thanks to A.S._id for his software.
The software:
Method 2 - .img backup
Method number 2 will create you efs.img backup on your internal sd. After that you can copy it to your computer.
What you have to do is this:
Method 3 - .tar.gz backup
This method will compress your efs folder into tar.gz file. This method is the same as choosing backup EFS folder in my rom(PhoeniX ROM)/Omega/Wanam/etc.
A tar.gz backup should look like this(On some devices there might be more files, but this picture was taken from Note II N7100 backup and it fully works):
What you have to do is this:
Restore methods
Now the fun begins
You will have to restore your backup when you have one or more of the folowing problem:
Fake IMEI (usually 004999010640000) or "null" IMEI
Blinking SIM card icon on the top tray… ETC
Unable to unlock your SIM card using your PIN
Fake Serial Number (usually 0000000) or "null" Serial
Unable to register to the network (usually comes with Fake IMEI & Fake Serial so check them.)
Attention please,
If you are 100% that your EFS folder is damaged and you have a working EFS backup with the right IMEI number, my recommendation is this:
Method 1 - restore .img backup
First method, is an automatic backup/restore software.
Special thanks to A.S._id for his software.
The software:
Method 2 - Restore .img backup
Method number 2 will restore your efs.img backup from your internal sd.
What you have to do is this:
Method 3 - restore .tar.gz backup
This method will restore .tar.gz backup.
A tar.gz backup should look like this(On some devices there might be more files, but this picture was taken from Note II N7100 backup and it fully works):
If you have like this, continue to the guide:
Method 4 - restore .tar.gz backup
This method will restore .tar.gz backup.
A tar.gz backup should look like this(On some devices there might be more files, but this picture was taked from Note II N7100 backup and it fully works):
If you have like this, continue to the guide:
Exit "Permanent Safe Mode"
When you in "Permanent Safe Mode" situation, it means that your EFS folder is broken.
If you succeeded in restoring your IMEI and you still stuck in this Safe Mode, use this guide:
Method 1
Method 2
This is all I can do for you friends, Worked alot on these methods to give you the best information.
Each method was tested by me and fully works.
If this helped you please press the "Thanks" button & Rate this thread 5 Stars.
If you like & appreciate my work please consider a donation!
Credits:
shnizlon
Candanga
A.S._id
dhiru1602
UtkarshGupta
P.M If you think that I forgot you
XDA:DevDB Information
Backup & Restore EFS + Get out from Permanent Safe mode - I9505, a Tool/Utility for the Samsung Galaxy S 4
Contributors
tamirda
Version Information
Status: Stable
Created 2013-09-05
Last Updated 2013-09-05
Click to expand...
Click to collapse
Mr Tamirda
The method this, made in terminal, working in one moto x? it's my question

Pika71 said:
Mr Tamirda
The method this, made in terminal, working in one moto x? it's my question
Click to expand...
Click to collapse
?????

slugthru said:
Will heimdall work as an alternative to restore the efs.img? Like this: heimdall flash --efs efs.img ?
It is used from download mode, like odin, so would work even if you cannot boot.
Click to expand...
Click to collapse
You can try and share your experiences.
From my personal experience with another device the dd method in terminal works just fine

Sorry but null IMEI isn't fake IMEI
Difference:
Null IMEI means you don't even have any data for the IMEI oh and it's bad!
fake IMEI means you do have a data which is corrupt. Nothing more only digits has been changed.
There's a different between those
I remember having null IMEI and my backup didn't help at all service center was forced to swap motherboard to get IMEI working.
---------- Post added at 02:26 PM ---------- Previous post was at 02:26 PM ----------
Pika71 said:
Mr Tamirda
The method this, made in terminal, working in one moto x? it's my question
Click to expand...
Click to collapse
It depends if it uses same permission. Also there is a way to fix a corrupt IMEI while in recovery
Also don't quote whole op

My brothers phone is in safe mode could i backup my efs folder and restore onto his device?

ok, i am stuck in factory mode but none of the methods described work because there is nothing in my efs folder - it is empty so there are no files to actually edit.

imei null on n7100 4.4.2

My phone was working fine before battery drained and it get switched off. But when i restarted the phone imei was null.
I have efs backup of 4.3 ( mj9 modem) but now i am on 4.4.2 . I tried restoring it but did not worked .
any help please..

sachinwadhwa46 said:
My phone was working fine before battery drained and it get switched off. But when i restarted the phone imei was null.
I have efs backup of 4.3 ( mj9 modem) but now i am on 4.4.2 . I tried restoring it but did not worked .
any help please..
Click to expand...
Click to collapse
try what i did here buddy. . post #3512
http://forum.xda-developers.com/showthread.php?p=57661153#post57661153
do it at tour own risk. goodluck!

edong23 said:
try what i did here buddy. . post #3512
http://forum.xda-developers.com/showthread.php?p=57661153#post57661153
do it at tour own risk. goodluck!
Click to expand...
Click to collapse
Thank you for your reply. Please help me to do this step wise

sachinwadhwa46 said:
Thank you for your reply. Please help me to do this step wise
Click to expand...
Click to collapse
this method works for me, but I am not sure if it will work for you. I have to warn you that I am not a dev, I am just a basic android user. I came up with this idea out of desperation because my phone cannot receive and make calls for almost 4 days. so do this at your own risk.
note:
* make sure your phone is rooted.
* make a copy of your old efs backup and all your important files in your computer or in a flash drive.
1. copy and write on a piece of paper your imei # which will be found at the back of your phone. it is 15 digit
2. copy your efs.img (not the folder that contain the efs image) to your internal storage. it is about 20mb. if there are two files then copy both.
3. connect to wifi and go to playstore and then download and install the IMEI Tool N7100 by Dr Ketan
4. download and install xposed installer and make sure to install update.
5. go to this thread and download and install imei changer
http://forum.xda-developers.com/xposed/modules/xposed-imei-changer-t2847187
make sure to activate it in exposed. then reboot your phone.
6. using ES File Explorer or any file manager with root privelege, go to /efs and delete all files
7. open imei changer then input your imei # (the one that you copied at the back of your pbone) then save. to make sure that your imei has changed dial *#06#. check if your imei if its the one you have written. if not go again to imei changer and change then make sure to save.
8. open IMEI tool by dr. ketan and restore efs backup. it will ask for root privelege so click grant.
9. after restoring efs, reboot to recovery and wipe cache and dalvik then reboot. check if you have data connection.
10. if its not working then go to recovery and make a full wipe and install new touchwiz rom (i used DN4 when I did this, but its up to you whatever you like). and repeat the steps.
* that's all I did mate. there is no scientific explanation about the process that I made, but when I did those things, my phone is working fine again. hopefully it will work for you brother. Good luck and God bless!

edong23 said:
this method works for me, but I am not sure if it will work for you. I have to warn you that I am not a dev, I am just a basic android user. I came up with this idea out of desperation because my phone cannot receive and make calls for almost 4 days. so do this at your own risk.
note:
* make sure your phone is rooted.
* make a copy of your old efs backup and all your important files in your computer or in a flash drive.
1. copy and write on a piece of paper your imei # which will be found at the back of your phone. it is 15 digit
2. copy your efs.img (not the folder that contain the efs image) to your internal storage. it is about 20mb. if there are two files then copy both.
3. connect to wifi and go to playstore and then download and install the IMEI Tool N7100 by Dr Ketan
4. download and install xposed installer and make sure to install update.
5. go to this thread and download and install imei changer
http://forum.xda-developers.com/xposed/modules/xposed-imei-changer-t2847187
make sure to activate it in exposed. then reboot your phone.
6. using ES File Explorer or any file manager with root privelege, go to /efs and delete all files
7. open imei changer then input your imei # (the one that you copied at the back of your pbone) then save. to make sure that your imei has changed dial *#06#. check if your imei if its the one you have written. if not go again to imei changer and change then make sure to save.
8. open IMEI tool by dr. ketan and restore efs backup. it will ask for root privelege so click grant.
9. after restoring efs, reboot to recovery and wipe cache and dalvik then reboot. check if you have data connection.
10. if its not working then go to recovery and make a full wipe and install new touchwiz rom (i used DN4 when I did this, but its up to you whatever you like). and repeat the steps.
* that's all I did mate. there is no scientific explanation about the process that I made, but when I did those things, my phone is working fine again. hopefully it will work for you brother. Good luck and God bless!
Click to expand...
Click to collapse
I followed the same procedure but did not worked.
One more thing i would like to mention that in recent past i got my complete pcb replaced by samsung service center but imei was same. and the backup of efs which i did was on previous pcb/motherboard. could that be the reason i am not able to restore imei?