[Q] baseband - Xperia Arc Q&A, Help & Troubleshooting

Good Evening guys.
I read on a comment for DooMLoRD saying that if we want to downgrade we should exclude baseband flashing via flashtools, what will this avoid?
I mean if someone included baseband flashing, what will it do to the device?

i don't know how to describe it well.
but baseband is a band that controls all transmitted frequencies. it has something to do with baseband chipset. it affects radio signalling, modem, and other data transfers via radio frequency.
you MUST extremely cautious whenever you want to change baseband.
you MUST check it's compatibility with your phone, otherwise you'll end up brick the precious phone.

gogo415 said:
i don't know how to describe it well.
but baseband is a band that controls all transmitted frequencies. it has something to do with baseband chipset. it affects radio signalling, modem, and other data transfers via radio frequency.
you MUST extremely cautious whenever you want to change baseband.
you MUST check it's compatibility with your phone, otherwise you'll end up brick the precious phone.
Click to expand...
Click to collapse
so as a conclusion, the baseband driver will get corrupted?!

yes, if it's not compatible with our device.

Related

[Help] Phone won't detect sim. Unknown Baseband and IMEI

So... I seem to be having the efs corruption issue with my co-worker's phone. I've been searching all over and have found how others have solved the problem, but it seems that our nv_data.bin is not located in our efs directory.
Does anyone have any idea where these files are? I need to check the last modified dates of their backup files to see if I can restore them >.<
Any help is greatly appreciated!!
Bump.. If anyone knows where these files are this could help us from running into the corrupt efs problem that many people have had. Usually backing up your efs prevents your phone from becoming unable to function as a phone.
I do remember reading something about our unlock code not being present in our nv_data.bin.. And when I check my efs folder in both my, as well as my co-worker's phone there is no nv_data.bin so maybe it has been relocated??
Anyone with knowledge on this subject.. your input would be greatly appreciated! I'm also gonna read over the unlock threads to see if there is any relevant info there.
I am having this problem now, I know you posted this over a month ago, but please tell me you know the location of the backup files or any other solution for this?'
Thank you,
[Q] T989 - Baseband and IMEI Unknown
I have searched and read many threads already. I understand the i9100 uses a file called nv_data.bin and requires its .bak file for a fix.
But, I dont think the t989 is the same because these files dont seem to exist, or at least not in the locations the threads for i9100 state. I am wondering if anyone has had this problem and/or how they fixed it. I know it was caused because of trying to unlock, but I'm looking for a solution.
Thanks!
just buy one of those $20 online unlock or go to your local phone kiosk to have it unlocked
any one with a machine to unlock Samsung phones can get this phone unlocked easily
there's no software unlock yet, as you have found on your searches
I have T-Mobile and don't really care for the unlock, it was a mistake. At this point, I just want to fix the unknown IMEI and unknown Baseband issue. Because of this problem my phone cannot get a signal... Will performing a machine unlock fix this problem?
Note: When I type in *#06# the response is not my IMEI number. It says "null"
svahora said:
I have T-Mobile and don't really care for the unlock, it was a mistake. At this point, I just want to fix the unknown IMEI and unknown Baseband issue. Because of this problem my phone cannot get a signal... Will performing a machine unlock fix this problem?
Note: When I type in *#06# the response is not my IMEI number. It says "null"
Click to expand...
Click to collapse
You can try to find someone locally with a SPT Box2. This unit can flash, unlock & repair IMEI on SGH-T989(d). I was gonna pick one up, but they are like $250 yikes !!
KillaHurtz said:
You can try to find someone locally with a SPT Box2. This unit can flash, unlock & repair IMEI on SGH-T989(d). I was gonna pick one up, but they are like $250 yikes !!
Click to expand...
Click to collapse
What does the (d) stand for?
And, how can I make sure this never happens again in the future? I know there are backup options out there (CWM, Nandroid), but are there any that make a complete clone of the phone's image? In case I mess up the efs or IMEI files again I can restore and be ok.
Thanks!
T989D = Canadian release of T989
they are identical, the just use the D for Canadian
AllGamer said:
T989D = Canadian release of T989
they are identical, the just use the D for Canadian
Click to expand...
Click to collapse
Would a Nandroid backup fix this in the future?
is hard to say, we have no idea where is the real IMEI information is being stored in the new models, but is no longer in the old EFS folder
AllGamer said:
is hard to say, we have no idea where is the real IMEI information is being stored in the new models, but is no longer in the old EFS folder
Click to expand...
Click to collapse
I wonder if the new Galaxy Nexus has its IMEI files stored similarly. If so, we can join forces with that forum group.
If Android is not mounting your firmware properly in the system this will cause no baseband and no imei detected. i would try and flash the stock rom to make sure.
-Mr. X- said:
If Android is not mounting your firmware properly in the system this will cause no baseband and no imei detected. i would try and flash the stock rom to make sure.
Click to expand...
Click to collapse
Did it twice, the stock rom, modem, and kernel.
The radio (modem firmware) might have got corrupted if somebody tried to flash international GS2 ROM or modem.
Try to flash only the Radio (KL1 is the latest for T-Mobile) via ODIN (use PDA slot).
cyberjam said:
The radio (modem firmware) might have got corrupted if somebody tried to flash international GS2 ROM or modem.
Try to flash only the Radio (KL1 is the latest for T-Mobile) via ODIN (use PDA slot).
Click to expand...
Click to collapse
Would the KL1 work any different than the older one? I tried ODINing the original one, and it didn't work and increased the count so I didn't try the KL1.
I just got my replacement phone yesterday for this same problem. Flashed the stock kernal, and also the modem just to be safe and nothing would fix it. From what I know its just a hardware issue, not software. I was chatting with samsung and t-mobile people about this trying all kinds of fixes to nothing left but hardware defect.

flashing a new radio???

is there a way to put a new radio into a rom before flashing it onto your phone or do you need to flash a radio completely seperately than when you flash the rom?
harwooc said:
is there a way to put a new radio into a rom before flashing it onto your phone or do you need to flash a radio completely seperately than when you flash the rom?
Click to expand...
Click to collapse
you can flash a rom at any time, or update radio at any time..
i was hoping to just simply change a file in the rom's foler or something instead if that was possible?
harwooc said:
i was hoping to just simply change a file in the rom's foler or something instead if that was possible?
Click to expand...
Click to collapse
The radio is completely seperate from the roms, so you cannot change anything in the rom. Flashing the radio is quite simple, you put the radios zipfile on the root of your sdcard reboot into your bootmanager and it will ask you if you want to update, you choose yes and reboot. That's it. If the radio sucks for you, you can always revert back to one that worked.
wow that is alot simpler than i thought it was. i read around and there were some sites saying it was alot more complicated than flashing roms
will i need to do anything about getting radio-off? some sites said something about that but i have no idea what that really even means i just have security-off
harwooc said:
will i need to do anything about getting radio-off? some sites said something about that but i have no idea what that really even means i just have security-off
Click to expand...
Click to collapse
In order to flash radios, roms, kernels etc you need s-off and to be rooted. That's all, hope that helps.
Changing bootloaders and radios can brick a phone so make sure everything is ready to go...
increduloustoo said:
Changing bootloaders and radios can brick a phone so make sure everything is ready to go...
Click to expand...
Click to collapse
Changing a bootloader can brick a phone, switching a radio can't. Even if you flash a radio that is not for your phone and you get a bootloop you can always do a battery pull, hold down-volume + power and flash the correct radio.
[Noob alert] can you backup your existing radio?
dankblaze said:
Changing a bootloader can brick a phone, switching a radio can't. Even if you flash a radio that is not for your phone and you get a bootloop you can always do a battery pull, hold down-volume + power and flash the correct radio.
Click to expand...
Click to collapse
Is there a way to separately backup the radio (in case the new one is problematic)?
Alternately, if you do a Nand Backup through CWM Recovery, which apparently does a complete backup of the phone at that point, does this also include the current radio? Which means, if you flashed a crappy new radio, you'd be able to boot into recovery and Nand Restore the phone, right?
Sorry about the noob questions, but in the Eris world (my prev phone) it was often said that flashing a bad radio was the surest way to brick your phone...
Thx
WhistlingDog said:
Is there a way to separately backup the radio (in case the new one is problematic)?
Alternately, if you do a Nand Backup through CWM Recovery, which apparently does a complete backup of the phone at that point, does this also include the current radio? Which means, if you flashed a crappy new radio, you'd be able to boot into recovery and Nand Restore the phone, right?
Sorry about the noob questions, but in the Eris world (my prev phone) it was often said that flashing a bad radio was the surest way to brick your phone...
Thx
Click to expand...
Click to collapse
Nope, and it's strictly a software backup. Just make sure you check md5 before flashing new radio.
Sent from my Incredible 2 using XDA App
WhistlingDog said:
Is there a way to separately backup the radio (in case the new one is problematic)?
Alternately, if you do a Nand Backup through CWM Recovery, which apparently does a complete backup of the phone at that point, does this also include the current radio? Which means, if you flashed a crappy new radio, you'd be able to boot into recovery and Nand Restore the phone, right?
Sorry about the noob questions, but in the Eris world (my prev phone) it was often said that flashing a bad radio was the surest way to brick your phone...
Thx
Click to expand...
Click to collapse
No need to backup the radio, just download the correct a different radio for your specific phone if you have any issues with the one you flashed, then boot into recovery plug in your device and choose "toggle usb", that will mount your phone to your PC and you can drag the new radio to the root of your SD card, reboot into bootloader and flash it just like you did the prior. A bad radio will never brick your phone, it will just not allow it to boot or cause other problems when booted. As long as you keep a few different radios meant for your device on your pc you can always drag and drop them into recovery.
Also, Nandroid does not backup radios, the radio does not change when switching roms, it stays the same unless you manually install a new one through bootmanager.
dankblaze said:
No need to backup the radio, just download the correct a different radio for your specific phone if you have any issues with the one you flashed, then boot into recovery plug in your device and choose "toggle usb", that will mount your phone to your PC and you can drag the new radio to the root of your SD card, reboot into bootloader and flash it just like you did the prior. A bad radio will never brick your phone, it will just not allow it to boot or cause other problems when booted. As long as you keep a few different radios meant for your device on your pc you can always drag and drop them into recovery.
Also, Nandroid does not backup radios, the radio does not change when switching roms, it stays the same unless you manually install a new one through bootmanager.
Click to expand...
Click to collapse
Actually, a radio can brick your phone because it is both writing the baseband image and that in turn writes to the radio's NVRAM (APN settings, etc). If the file is corrupted or not flashed completely, it can make the baseband chip non-responsive to upgrades, thereby bricking the phone. Trust me it happens. I was working on an Incredible 2 that had a corrupted radio flashed and there was no recovering. Not even manual edits to the NVRAM with CDMA workshop would work.
So while it is not likely, the radio can definitely do it. Usually just flashing again will fix errors, but not always.
Just always make sure to check MD5 from the phone before flashing and download from trusted sources.
ABQNM said:
Actually, a radio can brick your phone because it is both writing the baseband image and that in turn writes to the radio's NVRAM (APN settings, etc). If the file is corrupted or not flashed completely, it can make the baseband chip non-responsive to upgrades, thereby bricking the phone. Trust me it happens. I was working on an Incredible 2 that had a corrupted radio flashed and there was no recovering. Not even manual edits to the NVRAM with CDMA workshop would work.
So while it is not likely, the radio can definitely do it. Usually just flashing again will fix errors, but not always.
Just always make sure to check MD5 from the phone before flashing and download from trusted sources.
Click to expand...
Click to collapse
I stand corrected, thanks for the further input.
I have found it best to transfer the radio file to the SD card using a card reader connected directly to a PC and verify the MD5 on the final media as to connect through the data cable and check MD5 on the PC and assume the transfer went OK.
Of course the best way is to download to phone itself and check the MD5 there.
Either way just remember after flashing the radio, either rename the file or move it to a folder so it's not right there in the root in case you want to use hboot for anything else.
You won't have to wait for the scan AND choose NO to do something else.
what kind of radios can you flash to the incredible 2? can you flash a tmobile radio?
rehkhan97 said:
what kind of radios can you flash to the incredible 2? can you flash a tmobile radio?
Click to expand...
Click to collapse
Definitely not. If you are stock, you don't need to worry as the radio is included with the update. If you are rooted, there are two branches of radios -- one for the Verizon Incredible 2 and one for the Chinese CDMA version. You only flash the Verizon one unless you are on that Chinese carrier.
Link to Available Radios
The Verizon Radios always start with x.xx.01.xxxx where the Chinese radios are x.xx.50.xxxx.
ABQNM said:
Definitely not. If you are stock, you don't need to worry as the radio is included with the update. If you are rooted, there are two branches of radios -- one for the Verizon Incredible 2 and one for the Chinese CDMA version. You only flash the Verizon one unless you are on that Chinese carrier.
Link to Available Radios
The Verizon Radios always start with x.xx.01.xxxx where the Chinese radios are x.xx.50.xxxx.
Click to expand...
Click to collapse
Thanks. But which update are you talking about? the gingerbread update? And also, does the phone need to be activated to work on tmobile?
rehkhan97 said:
Thanks. But which update are you talking about? the gingerbread update? And also, does the phone need to be activated to work on tmobile?
Click to expand...
Click to collapse
There were 2 radios that came in GB updates. Follow the link to the radio thread and you can match ROM version to radio version. The newest radio came out with the latest update a few days ago and has not been updated to the OP in that thread, so check the end for the newest.
Sent from my brain using human to phone transport technology.
I would suspect its a bad idea to flash a chinese based radio into a us based phone?

[Q]Differences between baseband in 4.1.2

Hey guys,
Ive got a question. I cant find an answer as to how these differences in baseband version would affect my day to day phone usage. The reason is because i really want to go back to using AllianceRom 1.0 which has a XXDMA6 baseband and hasnt been updated since. Whats the big difference between DMA6 and DMB6 anyways?
Baseband? That's just the base rom. Well xxdmb6 seems to have fixed the battery issues for many users.
this is XXXDDDAAA
Isn't the baseband just a firmware controlling the radios. I mean that's my understanding. But that's not my question. I just want to know if these updates are region specific or what exactly has been changed to improve this battery life? I mean I honestly didn't notice much of a difference since I was using DMA6 and the latest DMB6
Sent from my GT-N7100 using xda premium
Baseband and the firmware itself are different. Baseband is a part of modem. It is just related to sending the signal to boot up the phone and calls.
Also dmb6 had a new change list. So I think there could be some more under the hood.
this is XXXDDDAAA
UtkarshGupta said:
Baseband and the firmware itself are different. Baseband is a part of modem. It is just related to sending the signal to boot up the phone and calls.
Also dmb6 had a new change list. So I think there could be some more under the hood.
this is XXXDDDAAA
Click to expand...
Click to collapse
Technically speaking a baseband contains the radio firmware that controls basic low level functions such as gps, network and wifi..and that is what I meant when I said it's just a firmware. But it doesn't make sense when you say it sends signal to boot the phone, how is that?
Sent from my GT-N7100 using xda premium
bushako said:
Technically speaking a baseband contains the radio firmware that controls basic low level functions such as gps, network and wifi..and that is what I meant when I said it's just a firmware. But it doesn't make sense when you say it sends signal to boot the phone, how is that?
Sent from my GT-N7100 using xda premium
Click to expand...
Click to collapse
Well the radio or baseband or modem sends the signal to boot when you press power button.
Atleast that was what I read at XDA university.
this is XXXDDDAAA
UtkarshGupta said:
Well the radio or baseband or modem sends the signal to boot when you press power button.
Atleast that was what I read at XDA university.
this is XXXDDDAAA
Click to expand...
Click to collapse
Baseband is part of SW that controls radios of device like phone and network, wifi, bluetooth etc
When you press power button, the bootloader send signal to boot device. and once device boots, kernel takes control.
the bootloader is code that is executed before any Operating System starts to run. Bootloaders basically package the instructions to boot operating system kernel. So pressing power button, bootloader gets activate and direct the device to load OS.
You can start device even absence of baseband, as many cases we can see unknown baseband though they have normal booting device but without network. So baseband have no role in booting device.
dr.ketan said:
Baseband is part of SW that controls radios of device like phone and network, wifi, bluetooth etc
When you press power button, the bootloader send signal to boot device. and once device boots, kernel takes control.
the bootloader is code that is executed before any Operating System starts to run. Bootloaders basically package the instructions to boot operating system kernel. So pressing power button, bootloader gets activate and direct the device to load OS.
You can start device even absence of baseband, as many cases we can see unknown baseband though they have normal booting device but without network. So baseband have no role in booting device.
Click to expand...
Click to collapse
I would assume he meant when he mentioned it boots the device he meant to say the baseband wakes the device whenever someone calls or a message is received. That would make sense.
So its safe to assume that the bootloader is like a BIOS, firmware is like the OS, and the Baseband is just the drivers between the OS and the Radio related hardware such as the wifi and bluetooth.
bushako said:
I would assume he meant
Click to expand...
Click to collapse
May be, but pressing power have nothing to do with baseband thats i want to say.
bushako said:
So its safe to assume that the bootloader is like a BIOS, firmware is like the OS, and the Baseband is just the drivers between the OS and the Radio related hardware such as the wifi and bluetooth.
Click to expand...
Click to collapse
Just difference is in Android firmware itself contains bootloader sometimes.
While on PC it's on MoBo isn't? b'coz without even HDD we can bootup to BIOS.
But yes it is same what you said.
Okay forget to answer original question
I believe baseband is best which comes packed with your ROM unless you are having any network related issue.
In such case i recommend to flash baseband one from latest for your region/carrier. b'coz baseband contains drivers for network and radio and may be they have best one for your network.

Flash Tool Baseband update

Hi,
I got ATT Xperi Ion with XperiaGPv2.1 but problem is I get garbled calls/digital noise and cant hear anyone.
Someone mentioned that flashing a ATT baseband might help. I did it through Flash Tool but seems my baseband wont change despite the fact that flashtool goes through the process 100%.
Please help what might be the problem?
the description for 'baseband version' in settings > about phone section doesn't seems to be attached to the actual baseband...meaning, when you flash a new firmware, that baseband description seems to follow it regardless of what you do with the actual baseband in flashtool...
about a month ago some one confirmed that, i'll try to find the thread...excluding a baseband during a flash of a different firmware DOES change things, as well as excluding everything but a baseband, which is what you did...and seems to be the best way to keep that garbled call thing at bay (someone found that it adds a UTC number in some hidden files)...but it won't change the description given in about phone...
thats all i know about it...i'm on JB 'h' .211 on an LT28at with ATT's latest baseband and haven't had the garbled call problem for over a month...it just trashed my gps, though, haha...

i747m 4.4.2 edge work fine but no 3g reception

Mode S3 i747m Canadian SaskTel with official kitkat 4.4.2 installed. in my phone 2g and edge work fine but there is no 3g reception. I enable 3g wcdma still now reception. please help me? do I need to write NV? how to write I tried using cdma but no success. my phone is not rooted but it is unlocked. please help and tell me steps to follow. I am worried/
Who is your carrier?
Did it work previously? If so when did it start doing this? Did you recently flash anything?
Do not try messing with the NV Data. This should only be done if deternined to be absolutely necessary and only after other options have been explored. Ive helped fix a lot of devices where a simple modem or firmware flash wouldve worked, but people went straight to trying to fix the IMEI. If its determined thats what is needed, ill gladly help with it, but in your case it doesnt sound like that would make a difference at this point.
DocHoliday77 said:
Did it work previously? If so when did it start doing this? Did you recently flash anything?
Do not try messing with the NV Data. This should only be done if deternined to be absolutely necessary and only after other options have been explored. Ive helped fix a lot of devices where a simple modem or firmware flash wouldve worked, but people went straight to trying to fix the IMEI. If its determined thats what is needed, ill gladly help with it, but in your case it doesnt sound like that would make a difference at this point.
Click to expand...
Click to collapse
simple is that after unlocking i747m there is no 3g reception. imei is matched just /7 extra shows when I check using command *#06# . everything is fine and it is on 4.4.2 stock rom SaskTel carrier which I flash using odin. problem occurs after unlocking.
That is strange. No idea why unlocking it would have broken 3g.
I would backup any important data, including the internal sd card, then reflash the firmware and factory reset.
You can also try this either before or after a firmware flash (or both). Follow the instructions here: http://forum.xda-developers.com/showthread.php?t=2211690
This is generally used to solve GPS issues, but has been known to help with other problems as well. Might get lucky!
DocHoliday77 said:
That is strange. No idea why unlocking it would have broken 3g.
I would backup any important data, including the internal sd card, then reflash the firmware and factory reset.
You can also try this either before or after a firmware flash (or both). Follow the instructions here: http://forum.xda-developers.com/showthread.php?t=2211690
This is generally used to solve GPS issues, but has been known to help with other problems as well. Might get lucky!
Click to expand...
Click to collapse
I follow your steps still no success, it is i747m with stock rom 4.4.2 and I want to know weather I need to flash modem or to write NV file?
Is your baseband showing as NE6 or NF2? If so your modem should be fine. No other build will work anyway. And as far as messing with the NV data, i dont recommend it. I wouldnt know where anything related to the sim lock would be, and if you make a mistake it could really mess things up. What NV file are you referring to btw?
DocHoliday77 said:
That is strange. No idea why unlocking it would have broken 3g.
I would backup any important data, including the internal sd card, then reflash the firmware and factory reset.
You can also try this either before or after a firmware flash (or both). Follow the instructions here: http://forum.xda-developers.com/showthread.php?t=2211690
This is generally used to solve GPS issues, but has been known to help with other problems as well. Might get lucky!
Click to expand...
Click to collapse
weather unlocked SaskTel s3 i747m work on other countries 3g mobile networks???
DocHoliday77 said:
Is your baseband showing as NE6 or NF2? If so your modem should be fine. No other build will work anyway. And as far as messing with the NV data, i dont recommend it. I wouldnt know where anything related to the sim lock would be, and if you make a mistake it could really mess things up. What NV file are you referring to btw?
Click to expand...
Click to collapse
yes my phone baseband is NE6.
can I flash i747 stock 4.4.2 to my i747m ? will it help getting 3g signals? any other way to get 3 signals ?
You can try it. Hopefully itll help. I dont think its been asked yet, but did 3g ever work on that device?
DocHoliday77 said:
You can try it. Hopefully itll help. I dont think its been asked yet, but did 3g ever work on that device?
Click to expand...
Click to collapse
Thanks for your time.
Yes before getting unlocked 3g work fine on sasktel. now i move to another country and using it on Zong network here i get 2g edge but no 3g reception.
DocHoliday77 said:
You can try it. Hopefully itll help. I dont think its been asked yet, but did 3g ever work on that device?
Click to expand...
Click to collapse
yes 3g was working fine in Canada SaskTel now I move to another country and unlock my i747m to use on zong network here but no 3g reception here. my phone have 4.4.2 stock rom.
Its very possible that the new carrier broadcasts their signal using different bands/frequencies than what the device uses.
This site will show you your devices Cellular Network capabilities.
http://pdadb.net/index.php?m=specs&id=4731&c=samsung_sgh-i747m_galaxy_s_iii_lte_16gb
You may need to search online or call the carrier to find out what they use. Wikipedia often has this information.
DocHoliday77 said:
Its very possible that the new carrier broadcasts their signal using different bands/frequencies than what the device uses.
This site will show you your devices Cellular Network capabilities.
http://pdadb.net/index.php?m=specs&id=4731&c=samsung_sgh-i747m_galaxy_s_iii_lte_16gb
You may need to search online or call the carrier to find out what they use. Wikipedia often has this information.
Click to expand...
Click to collapse
my phone supports GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+ but problem is somewhere in software told by zong network help line
Those are the network technolgies supported. What matters in this case is what frequencies are used by these technologies.
GSM850, GSM900, GSM1800, GSM1900, UMTS850 (B5), UMTS1900 (B2), UMTS2100 (B1), LTE1700/2100 (B4)
Those are the bands your device operates on. For example, if that carrier uses the 1700 band for 3G, you probably wont be able to use it. So if you can determine what they use, you can compare it to what the device is compatible with.
Support can be useful for certain things, but unless your problem is covered by what is on their computer screen, they often wont have a clue and will be quick to blame whatever comes to mind first. This happens often enough with just about every company that i simply dont trust what they say most of the time.
If nothing else, checking if they use the frequencies your device supports is much easier than trying to hunt down a very uncommon hardware or software problem. At least you could eliminate it as a possible cause. And if my suspicion is correct, you will save a lot of time you would otherwise spend diagnosing a problem that does not exist.
DocHoliday77 said:
Those are the network technolgies supported. What matters in this case is what frequencies are used by these technologies.
GSM850, GSM900, GSM1800, GSM1900, UMTS850 (B5), UMTS1900 (B2), UMTS2100 (B1), LTE1700/2100 (B4)
Those are the bands your device operates on. For example, if that carrier uses the 1700 band for 3G, you probably wont be able to use it. So if you can determine what they use, you can compare it to what the device is compatible with.
Support can be useful for certain things, but unless your problem is covered by what is on their computer screen, they often wont have a clue and will be quick to blame whatever comes to mind first. This happens often enough with just about every company that i simply dont trust what they say most of the time.
If nothing else, checking if they use the frequencies your device supports is much easier than trying to hunt down a very uncommon hardware or software problem. At least you could eliminate it as a possible cause. And if my suspicion is correct, you will save a lot of time you would otherwise spend diagnosing a problem that does not exist.
Click to expand...
Click to collapse
Thanks for your time. these are the frequencies supported by my carrier
900/1800 MHz GSM 2G / GPRS 2.5G / EDGE 2.75G
2100 MHz W-CDMA (UMTS) 3G / HSPA 3.5G / HSPA+ 3.75G
1800 MHz LTE 4G
oh yes I got the solution finally and I want share here may It help others too, using this command *#0808# I change to this option RNDIS + DM + MODEM. then I download QPST install it, configure it and then go to client and then in download mode there I create I back up of NV file which is very very very important if you want to play with NV file, after creating my phone original NV back,i start playing with NV and write NV of i747 model to my i747m model and restart my mobile and I am very very happy to see a working H+ sign on the top of my screen I am very very happy I invest a lot of time so I am here to help anyone who want to ask me any question...
Unfortunately, its against forum rules to post this information....
Also, I'm not sure exactly what you did, but in general it is not a good idea to apply the NV Data of one device to another. (Not asking you to explain, more of a caution to others who might consider trying that. Like I said, we aren't allowed to share that information. )
DocHoliday77 said:
Unfortunately, its against forum rules to post this information....
Also, I'm not sure exactly what you did, but in general it is not a good idea to apply the NV Data of one device to another. (Not asking you to explain, more of a caution to others who might consider trying that. Like I said, we aren't allowed to share that information. )
Click to expand...
Click to collapse
problem solved but I am facing another which is that my imie number is changed. I want to change my imei to its original and also I want to keep current nv data of my mobile except imie
That's one big reason to never use another devices NV Data. If the device it came from is still being used, that imei may become blacklisted very soon.
PM me and I will try to help you change back to the correct one. We cannot discuss this here, so PM is the only way I can try to help.

Categories

Resources