Develop Bugs

Help restoring null IMEI - lost EFS Folder

I bought an unlocked samsung captivate glide. At first it worked normally but then the sim card was not recognized any more.
I started studying what the causes of this could be.
Baseband is shown as "unknown" and when i put *#06# IMEI says "null/null".
Now I suppose it is a problem with the files in the EFS folder.
When i open nav_bin file with hex editor it is all blank, all the fields have "ff" and the last ones "00"
I need to restore the EFS folder in order to have at least a generic IMEI, isn't it wright? How can i manage to do this?
I don’t have any backup of the original files; anyway i don’t care having a generic IMEI to begin with.
Any help is appreciated

Any way of restoring baseband and/or IMEI ??

margram said:
Any way of restoring baseband and/or IMEI ??
Click to expand...
Click to collapse
You can try flashing the phone to stock with Odin...

Restore to factory version efs partition

Sometime ago I flashed one version of Lollipop to the newest one, but my phone during the process corrupted the efs file and now sometimes I flash a different version of Marshmallow 30b my efs partition gets corrupted. If someone can explain me how to restore to factory the efs file for not having these problems it will help me a lot.

i have same problem my imei number is null and Baseband version unknown.

I have T-Mobile G3 (d851). I think I have corrupted my EFS partition while flashing a custom ROM. Now I dont have Baseband Ver, IMEI, IMEI SV, or any other number. My Simcard is also not working.
I had backups with EFS, which I tried restoring. Doing that didnt bring IMEI or any information back, nor my simcard is working.
Any help with what to do?

root device
Then enable usb debbuging
Go command promot in adb.
commands are:
adb shell
su
setprop sys.usb.config diag,adb
You will get LGE Mobile Phone. You will need drivers for it.
Then start adb again. At androidbrick.com imei restore part 2 you have instructions for it.
Erase 0p21, 0p22 and 0p24 (i'm not sure. You have commands on androidbrick.com)
Then start emmc download app from qualcomm. Add COMx port, go software download and restore file from .qcn. you can find and download qcn file on gsm forum. Search for d855 qcn backup. You will net to modify imei with hex. - for example HxD Editor. All imeis in g3 are starting from 08 3A XX XX XX XX XX XX XX.
By the way this will unlock simlock in any phone

Steps to recover IMEI using qcn

How does one change the IMEI?
I've tried this without success:
1. Root your device
2. Download and install QSPT and UltraEdit (HxD would also do).
3. Download an IMEI converter.
4. Get hold of a working qcn (I used my own which I know works in my other P2). Open the file by using Ultraedit/HxD and try to locate the IMEI. In my case it often starts with "08 8A...".
5. Use the IMEI converter and input your true IMEI. Memorize the output.
6. Return to the qcn file. Write it over with the IMEI output you got in step 5.
7. Save the file.
8. In a terminal enter:
su
setprop sys.usb.config rndis,diag,adb
9. Restore the qcn file from step 7 by using QSPT. You click on QPST configuration and go to "ports". If your port isn't already visible go to the device manager, look up the Qualcomm Diag port and add it. For me I believe it's COM9. Now you click on "start clients", then "software download". Tick the "Allow phone/file ESN mismatch", locate your saved qcn file and start restoring it.
10. All done. Reboot!
Apparently some XDA members managed to get their signal back once the modem was deleted so I guess somebody should know.
Other methods I've tried include flashing stock MM and installing OTA until you're on S251 as well as restoring an older full TWRP backup from when your signal used to work. Needless to say, they didn't work.

This procedure worked for me. Lenovo K6 Power with Qualcomm proc.
Successfully I found other users qcn file and wrote my IMEI in it.
Signal is back but diag port disappeared and I can't turn it on again.

WhatsApp me or call me 8436243173

WHERE CAN I GET THIS QNCN ? I'm confused

I had same problem, here are my steps with qcn backup file from working P2. My IMEIs stays right. Sorry for my english and here is my link and read next threads from that forum.
https://forum.xda-developers.com/showpost.php?p=73444145&postcount=70

mL-7 said:
This procedure worked for me. Lenovo K6 Power with Qualcomm proc.
Successfully I found other users qcn file and wrote my IMEI in it.
Signal is back but diag port disappeared and I can't turn it on again.
Click to expand...
Click to collapse
Have K6 power with IMEI turned 0 after fastboot erase modemst1 and 2. Could you please detail the steps to restore IMEI?

NO Imei after hard flashing by MSM Tool

How can I restore IMEI of my phone. I also don't have any backup of IMEI. Tried a lot of methods but most of them are old and not working. Do we have a chance here?
Edit;
I restored some other imei using qpst and .qcn file but now I it has become a mess to write my own imei by coding in qcn file.

is your problem solved?

[REQUEST] Anyone willing to extract and share qcn / xqcn backup ?

Hi,
I recently tried to flash qcn on my OnePlus 7T and it seems that I lost efs data (some sensors aren't working now).
To extract qcn or xqcn file you need to enable usb diagnostic port (in phone app dial *#801# and click the second and fourth buttons).
Doing so will make your phone detectable in Qualcomm softwares.
To extract qcn, use QFIL and click Tools>QCN Backup/Restore. In the field "QCN file path" write the path to the directory you want to save the backup, and also write the name of the file that will be created. Then click Backup QCN.
To extract xqcn, use QPST Software Download, and go to the Backup tab. Click Browse to select the destination for the xqcn backup, and set a name to the backup that will be created. Then click start.
Doing this process is quick and should take approximately 5 minutes if you already have the QPST software.
In case you need it, I have the installer from Qualcomm for QPST 2.7.480 :
http://www.mediafire.com/file/nm0zlac003tn41j/qualcomm_qpst_setup_2.7.480.zip/file
Also you have to know that your IMEI will be visible in these backups, and you should remove them using an hex editor to replace it with some random numbers or zeros before sharing it with me or anyone.
If you need informations on how to find your IMEI in your qcn or xqcn backup using an hex editor, I will explain it in this thread too.
Thank you

Are you saying with these same methods you lost efs data or you did a mistake while flashing ?

Thanks @egekonuk for your reply.
In fact I was trying to flash international rom version on my TMobile Oneplus 7T by editing MSM download tool (using x64dbg which is a software sharing many functionalities with IDA Pro).
I did not managed to flash international but yes, I lost efs in the process.

Superboy58 said:
Thanks @egekonuk for your reply.
In fact I was trying to flash international rom version on my TMobile Oneplus 7T by editing MSM download tool (using x64dbg which is a software sharing many functionalities with IDA Pro).
I did not managed to flash international but yes, I lost efs in the process.
Click to expand...
Click to collapse
Just curious why you didn't do the other posted method to go from TMO to international? I did the other method and it worked out just fine. Of course I don't know if that very friendly person is still doing unlocks or not.
Is there a difference between the QCN and XQCN between ROMs?

@amcferrin90 yes I didn't mentioned that but it's because my device was not SIM unlocked by T-Mobile. I bought it on ebay and I was not aware it was not paid off, and seller refused a return.
If I was SIM unlocked, I'd be able to unlock the bootloader and flash the international rom using fastboot.
I did not understand what you meant about qcn, xqcn and roms.
To me, qcn and xqcn are different because xqcn backups are larger than qcn ones.
I think xqcn contains some efs data, but I'm not sure about this.
Would you be ok to make a xqcn backup and share it with me?
Thanks

I also need a backup of QCN.(please)