[GUIDE]No BASEBAND version, NO signal, CANT call, etc... - Galaxy S II General

Hi everyone, I made something funny that worked today
Scenario is the phone has no IMEI, no BASEBAND, cant enter the service code *#*#197328640#*#*, can’t call and gives force close, and in short the phone is useless. HAHAHA lol.
The history of the phone is HARD BRICKED after my big brother flashed a kernel onto this phone after upgrading to 4.0.4. he wiped user data and along with the EMMC file, it became unresponsive and doesn’t turn on anymore.
I had it recovered using MEDUSA box and after I got the BOOT/DOWNLOAD mode. I flashed a firmware with DXxx.xxx baseband. im so glad that the phone was completely working again, ALMOST hahaha. When I inserted my stupid SIM, it doesn’t want to pick up signal an found out that there is no BASEBAND version as I checked it on about phone, or dialing *#1234#
I have done some research and I knew that I is gonna be the RIFF box again that will fix this thing. What am I gonna do to a phone that doesn’t pick up signal at all. I flashed it over and over again even the MODEM alone but still no luck.
Things that I have done to have it work though with a wrong IMEI
1. Root the phone
2. Installed SGII repair
3. Backed up the efs folder (either using ROOTexplorer/the SGSII repair app)
4. Downloaded the EFS pro
5. Downloaded the .NET framework 4.0
I tried repairing the EFS using the GSII repair but still no good after reboot, and used the the EFS pro to repair it but still no good. After rebooting couple of times I don’t have signal.
Imma make this short now
1. Root your device using whatever method u can use
2. Install root explorer and copy EFS folder to your internal SD card then paste it somewhere on your computer. (name it as ORIGINAL EFS)
3. Now use the SGSII repair (download it in app market)
4. Use the repair method then back up the repaired EFS folder on save/restore option (REPAIRED by SGSII repair app)
5. Paste the .tar file to your PC/Laptop and extract it and name the EFS folder as repaired EFS folder
6. Use the EFS pro and click on format the EFS folder. (make sure before doing this, you have repaired the EFS and BACKED UP the repaired EFS using the SGSII app)
7. Connect your phone to your pc and mount the storage to your PC/Laptop
8. Copy the extracted file you have backed up on number 5 (using winrar)
9. Copy the content of the extracted repaired EFS by the SGSII repair app to the ROOT EFS folder of your phone.
10. Then click the Repair NV data / Attempt NV recovery
11. If that did not work just reboot the phone first and do the number 10
12. Reboot again the phone
13. Once rebooted the phone will then have the icon of w/out sim, has baseband, and once you inserted the sim it will then have coverage to your carrier
14. Do it with a little bit of luck
Enjoy your phone with wrong IMEI and the screenshots I have put on this thread are, after I have done everything but previously it doesn’t show the BASEBAND version and everything. but after i have done THESE steps, it suddenly displayed the baseband version and i had signal
I tried doing this but it has just gone with the no baseband version again
http://forum.xda-developers.com/showthread.php?t=1264021
These steps worked for me and I have a working phone with wrong IMEI.
Worked for me :highfive:
Any helpfull steps / posts / links that would completely recover the ORIGINAL IMEI would be gladly appreciated

[email protected] said:
Hi everyone, I made something funny that worked today
Scenario is the phone has no IMEI, no BASEBAND, cant enter the service code *#*#197328640#*#*, can’t call and gives force close, and in short the phone is useless. HAHAHA lol.
The history of the phone is HARD BRICKED after my big brother flashed a kernel onto this phone after upgrading to 4.0.4. he wiped user data and along with the EMMC file, it became unresponsive and doesn’t turn on anymore.
I had it recovered using MEDUSA box and after I got the BOOT/DOWNLOAD mode. I flashed a firmware with DXxx.xxx baseband. im so glad that the phone was completely working again, ALMOST hahaha. When I inserted my stupid SIM, it doesn’t want to pick up signal an found out that there is no BASEBAND version as I checked it on about phone, or dialing *#1234#
I have done some research and I knew that I is gonna be the RIFF box again that will fix this thing. What am I gonna do to a phone that doesn’t pick up signal at all. I flashed it over and over again even the MODEM alone but still no luck.
Things that I have done to have it work though with a wrong IMEI
1. Root the phone
2. Installed SGII repair
3. Backed up the efs folder (either using ROOTexplorer/the SGSII repair app)
4. Downloaded the EFS pro
5. Downloaded the .NET framework 4.0
I tried repairing the EFS using the GSII repair but still no good after reboot, and used the the EFS pro to repair it but still no good. After rebooting couple of times I don’t have signal.
Imma make this short now
1. Root your device using whatever method u can use
2. Install root explorer and copy EFS folder to your internal SD card then paste it somewhere on your computer. (name it as ORIGINAL EFS)
3. Now use the SGSII repair (download it in app market)
4. Use the repair method then back up the repaired EFS folder on save/restore option (REPAIRED by SGSII repair app)
5. Paste the .tar file to your PC/Laptop and extract it and name the EFS folder as repaired EFS folder
6. Use the EFS pro and click on format the EFS folder. (make sure before doing this, you have repaired the EFS and BACKED UP the repaired EFS using the SGSII app)
7. Connect your phone to your pc and mount the storage to your PC/Laptop
8. Copy the extracted file you have backed up on number 5 (using winrar)
9. Copy the content of the extracted repaired EFS by the SGSII repair app to the ROOT EFS folder of your phone.
10. Then click the Repair NV data / Attempt NV recovery
11. If that did not work just reboot the phone first and do the number 10
12. Reboot again the phone
13. Once rebooted the phone will then have the icon of w/out sim, has baseband, and once you inserted the sim it will then have coverage to your carrier
14. Do it with a little bit of luck
Enjoy your phone with wrong IMEI and the screenshots I have put on this thread are, after I have done everything but previously it doesn’t show the BASEBAND version and everything. but after i have done THESE steps, it suddenly displayed the baseband version and i had signal
I tried doing this but it has just gone with the no baseband version again
http://forum.xda-developers.com/showthread.php?t=1264021
These steps worked for me and I have a working phone with wrong IMEI.
Worked for me :highfive:
Any helpfull steps / posts / links that would completely recover the ORIGINAL IMEI would be gladly appreciated
Click to expand...
Click to collapse
A phone with wrong IMEI will be blocked in 2 days in my country

I accidentaly flashed in a i9100G ROM on my i9100 (regular one, no NFC and nothing extra), not even an unlocked one, and i lost all my phone thingys.
But i am a bit nerdie, so i searched for my problem here, and discovered that flashing an 9100G modem is a really bad idea, so i decided to flash an LP7 MODEM/RIL back and evrything went to normal (at least in my case)

arshu16 said:
A phone with wrong IMEI will be blocked in 2 days in my country
Click to expand...
Click to collapse
oh i see... my phone is unlocked and not provided by a network or something... it still working here though unlike the I9000 with wrong imei that i have flashed before... i wasnt able to back up the EFS of this phone before this happened due to it was hard bricked...

worf_1977 said:
I accidentaly flashed in a i9100G ROM on my i9100 (regular one, no NFC and nothing extra), not even an unlocked one, and i lost all my phone thingys.
But i am a bit nerdie, so i searched for my problem here, and discovered that flashing an 9100G modem is a really bad idea, so i decided to flash an LP7 MODEM/RIL back and evrything went to normal (at least in my case)
Click to expand...
Click to collapse
better backing up your EFS folder to your SD card cause it contains a very important file...

Related

IMEI Unknown, Base-band Unknown, Please Insert SIM card

Hi everyone. I know this problem is well known, and Ive done hours and hours of search online and on XDA but none of the solutions worked or maybe i didnt do it right!
The problem, My friend have flashed a Custom frimware (Litning 6) and lost his IMEI and Baseband some how, they tell Unknown, and now he cant access his SIM or network, the phone doesnt really see the SIM at all.
Ive tried to use Chainfires APK to fix it didnt work, and the Hex stuff really made me dizzy out. didnt know how to use it really.
Ive tried to recover to EFS stuff but i think his EFS is trashed and he didnt back it up..
Tried flashing 2.3.3 stock rom and 2.3.4 no luck. still no baseband or IMEI..
Any suggestions? im out of luck and depressed
Why are you out of luck and depressed if its your friends phone?
If you dont know and understand how to recover these details I would say flash to a stock rom and take phone into a SSC and let them repair it for you.
Same thing happened to me, the phone eventually showed firmware emergency error so I just gave it to samsung service centre, they replaced the logic board etc and got it back 3 weeks later
http://forum.xda-developers.com/showthread.php?t=1269989&page=4
Sent from my GT-I9100
ill look those links,,, but can i use someones EFS folder to fix this?
Ive checked the links. i think noth bin and .bak files are bad. cuz he already tried messin with them.. XD need new nv_data
you said that he LOST his IMEI.If thats true,and by using a root explorer with root access you can look inside the efs file or mark *#06# and see if nothing comes up,then without a backup theres no way you will get the original back without sending it away to the service centre(personal experience) but when it come back heres a good backup method.Easy as to backup and restore.
http://forum.xda-developers.com/showthread.php?t=1308546
cooza said:
you said that he LOST his IMEI.If thats true,and by using a root explorer with root access you can look inside the efs file or mark *#06# and see if nothing comes up,then without a backup theres no way you will get the original back without sending it away to the service centre(personal experience) but when it come back heres a good backup method.Easy as to backup and restore.
http://forum.xda-developers.com/showthread.php?t=1308546
Click to expand...
Click to collapse
Basicly his SGS2 is not even capable of bring a paper weight cuz its too light (100g) lool.. what a bummer... ill try to find a shop to fix it with a box or something,, thanks all!
If you check your nvdata.bin and md5 you will see that, they modified the same day you lost your imei. So you have to return back to those baks and I don't think you can use another device's efs since your imei is hidden in that file.
Sent from my GT-I9100
bsglan said:
If you check your nvdata.bin and md5 you will see that, they modified the same day you lost your imei. So you have to return back to those baks and I don't think you can use another device's efs since your imei is hidden in that file.
Sent from my GT-I9100
Click to expand...
Click to collapse
thanks.. tried that, they are curropted. i sent my friend phone to hard ware repair shop, he claimed he have something called Samsung tools and box which can repair the imei! will see
new solution lounched Fix Repair unknown base banad I9100
Asansam ver 1.6.5 Released
-Fix Repair unknown base banad I9100
Note 1:
we add 3 Solution for this problem after you click Repair unknown baseband and select i9100,procedure start after finishing Solution 1 and phone restart check imei (with *#06#) if solution work you must see your phone imei if you see that you can cLick cancel and enjoy your revived phone if not click on continue and wait until solution 2 finished
do same like after solution 1 (*#06#) work on phone if you get good answer click cancel if not continue for starting last solution if it's not work too,believe me fellas check for hardware fault
Somehow this has happened to my phone, it is not even rooted, I flashed a newer firmware because I'm with bell mobility and they are still on 2.3.3, but that was over a month ago and just yesterday my phone stopped reading my sim card, and the IMEI and baseband are unknown.. I've tried a factory reset and to reflash the firmware, but it is still not working..
Now I cannot find the stock bell mobility firmware either to send it back..
has anyone figured out how to fix this problem? Or what could have caused it in my case?
looks like the service centre is the only option. Best to back up the EFS before tinkering with anything.
my GT-I9100 does this when I let it completely run out of battery power. I've only noticed it since flashing the ICS leaks but this may have been a problem before and I've not noticed.
When I plug the phone into the charger and start it up *#06# IMEI shows as unknown and *#1234# shows unknown modem, I have a small airplane mode symbol and occasionally, a no sim card error.
To fix this I have to let it take a charge for a while with the phone on - then reboot WITHOUT the charger cable plugged in. I probably have some kind of hardware fault but its not that important to me. I have an EFS backup, well I have a few backups here and there
happened to me a few days ago
http://forum.xda-developers.com/showthread.php?t=1526733

[Q] SGS4 i9505 Lost Some EFS Data

Hi, I have been playing around with an i9505 and thought I had made a proper backup of my EFS data. Unfortunately that was not the case and I have only backed up the EFS partition, neglecting the others.
I then later chose the *#9090# : "DM/DUN/RmNet over HSUSB " option and allowed it to wipe my EFS data, believing I had a suitable backup.
Upon restoring said backup, my base band is unrecognized and I have no IMEI. The phone also fails to receive any signal.
My question is, will it be possible to recover from this mistake or should I consider it a brick?
d3v147 said:
Hi, I have been playing around with an i9505 and thought I had made a proper backup of my EFS data. Unfortunately that was not the case and I have only backed up the EFS partition, neglecting the others.
I then later chose the *#9090# : "DM/DUN/RmNet over HSUSB " option and allowed it to wipe my EFS data, believing I had a suitable backup.
Upon restoring said backup, my base band is unrecognized and I have no IMEI. The phone also fails to receive any signal.
My question is, will it be possible to recover from this mistake or should I consider it a brick?
Click to expand...
Click to collapse
You can try to use Kies 3 on your laptop to reload the stock firmware.Then put your phone in Download mode (with the phone completely off, press and hold the Volume Down and Power buttons) and connect it to your PC. The OS will install the necessary drivers (this may take a few minutes) and then you can select Tools -> Emergency firmware recovery in the Kies software. It'll prompt you for the model number (enter it in CAPS) and IMEI (both found under the battery) and then it'll download the correct firmware and then install it .If the problem still persist try to follow this thread and it might help you, and if still doesnt fix Go to service center for a repair. Have a nice day.
Thank you for you prompt reply. I have tried using both versions of Kies and have not been able to do an emergency recovery.
I have since managed to get the "Qualcomm NV Tools" of "EFS professional" to work and I have confirmed that my IMEI is still present on the phone.
When i try to uses the *#9090# hidden code, all I get is a blank screen. My belief is that the modem is simply not communicating with the phone anymore due to the option I chose "DM/DUN/RmNet over HSUSB". The message I saw was:
"Warning : Must read below guide All Communication between AP/CP- will be disconnected !
To return the normal mode, you must download efs12.tar file !
All NV data will be erased !
Really you want to use RmNET ?"
I'd really like to be able to undo this if anyone can help.
Dial *#1234# and tell me what appears pls :fingers-crossed:
Typing *#1234* gives:
Version
--------------
AP : I9505XXUEMK9
CSC : I9505H3GEMJ2
Apologies for the double post. I am wondering if I backup the NV data from another working i9505 with "Qualcomm NV Tools" and then write that to my phone if that will fix the problem?
I have made a backup of my existing NV and examined the resulting text file. It would appear that nearly everything is blank, except for a couple of fields, one of which I identified as IMEI (Block 00550 / 0x0226). This field is read only which explains why I still have an IMEI.
I would be extremely grateful if somebody could send me their backup, minus the 00550 (0x0226) block so I can avoid having to convince a friend to let me play with their phone.
I have been further investigating this problem and have found that the modem is not communicating with the phone. I believe this has something to do with NV items greater than 65536. This would make sense, as the usual NV backup tools do not save/restore items with a higher address.
Of particular interest to me is :
69674^"HSUSB RMNET Over HS Core"^"USB*"
But the versions of QXDM that are available do not seem to be able to read/write this value. I am hoping there is a command of some form to do this but I am unsure.
Joku1981 said:
Dial *#1234# and tell me what appears pls :fingers-crossed:
Click to expand...
Click to collapse
You're funny dude.
Sent from my GT-I9505 using XDA Premium HD app
Hi mate,
As soon as you clear EFS folder all data IMEI SIm LOck and EFS utils are gone. What u need to do just install new EFS with utils via Odin3 downloader. I have done this way many times. We call this EFS12 file for recovery, buy IMEI and CAL data will be erased. As soos as you get 0/01 IMEI you can try repaur IMEI for example Z3X BOX
exprxp said:
Hi mate,
As soon as you clear EFS folder all data IMEI SIm LOck and EFS utils are gone. What u need to do just install new EFS with utils via Odin3 downloader. I have done this way many times. We call this EFS12 file for recovery, buy IMEI and CAL data will be erased. As soos as you get 0/01 IMEI you can try repaur IMEI for example Z3X BOX
Click to expand...
Click to collapse
Where do I download this "EFS12" file? I have searched high and low.
d3v147 said:
Where do I download this "EFS12" file? I have searched high and low.
Click to expand...
Click to collapse
http://forum.xda-developers.com/showthread.php?t=2567133
NOTE 3 - Fix soft bricked.rar must be downloaded and extracted Then You have FULL EFS12 + ZEROED NVDATA
exprxp said:
http://forum.xda-developers.com/showthread.php?t=2567133
NOTE 3 - Fix soft bricked.rar must be downloaded and extracted Then You have FULL EFS12 + ZEROED NVDATA
Click to expand...
Click to collapse
I imaged all the block devices on the phone with the ones in the rar file you suggested and still: "Baseband unknown".
d3v147 said:
I imaged all the block devices on the phone with the ones in the rar file you suggested and still: "Baseband unknown".
Click to expand...
Click to collapse
I kept backups of all the images replaced and restored them as I had trouble loading recovery. I doubt images from another (different) phone were a great idea.
Recovery is working again but some image said there was not enough space on device to restore !?!
d3v147 said:
I kept backups of all the images replaced and restored them as I had trouble loading recovery. I doubt images from another (different) phone were a great idea.
Recovery is working again but some image said there was not enough space on device to restore !?!
Click to expand...
Click to collapse
Hi
You can try this way for GT-I9505 imei repair.
http://forum.xda-developers.com/showthread.php?p=51156577
[Q] SGS4 i9505 Lost Some EFS Dats
I did the same with SGS3 GT-I9305. *#9090# corrupted my S3 efs, imei and baseband.
How did you resolve your issue?
Please help!!!
Thanks

[Q] Survived from brick but i ve lost my IMEI

I tried to install the new version of CyanogenMod Snapshop but unfortunately afte the reboot of my LG G2 D802 the mobile phone bricked.
I read a lot around the Internet and finaly i succeeded to unbrick it. Th problem now is that i do not have IMEI (is null now). I read that there is one program that you can fix your disappeared IMEI but cannot work in my personal laptop. Do you know anything how to repair and fix my IMEI with my previous official IMEI (i have it in the box that i bought but i didnt have any backup of it).
Thank you
I am having the same problem. I was loading a milestone version of a rom and when it loaded after wiping there was no service whatsoever and everything is null. I understand it wiped the efs and I dont have a backup. I also understand that we can change the info back with the numbers off of the original box using dfa cdma tools. I have the program but my question is the 000000 code does not work when i try to unlock the phone. Anyone with any experience with this program that can help me to re write my meid???
bsbllfit7 said:
I am having the same problem. I was loading a milestone version of a rom and when it loaded after wiping there was no service whatsoever and everything is null. I understand it wiped the efs and I dont have a backup. I also understand that we can change the info back with the numbers off of the original box using dfa cdma tools. I have the program but my question is the 000000 code does not work when i try to unlock the phone. Anyone with any experience with this program that can help me to re write my meid???
Click to expand...
Click to collapse
Which program do you have?
Dfs CDMA tools
I don't have any personal experience with this, but I have done a ton of reading on this problem and it's become my biggest fear. From what I have gathered you have very very little chance of fixing this yourself. It most cases it goes back to the manufacturer. Can you tell us exactly how this happen?
I have no idea, i have been rooted for months and swapped roms like crazy. I wiped and installed a new rom and then it was getting no service so i tried to update profile and said it couldnt. Then check in the settings for the baseband and meid and unknown was shown across the board. Trying to figure it all out now!
I have had the same thing happen what cm did u install I had a d802 version on my ls980 restored it but now it will only accept a d802 modem and the signal is weak and drops out but it did show my ESN and imei and baseband again instead of unknown if I would have flashed it with a ls980 modem
Sent from my LG-D959 using xda app-developers app
Have you tried restoring a backup?
Sent from my dr87 v7 powered, Mahdified LG G2 (D801)
My problem started when I tried to update my LG G2 D8002 to the latest Cyanogenmod Kitkat Snapshop and i stuck in clockworkmod recovery loop after returning in CWM to take backup. I tried to connect it to my Laptop but i cannot have any access in my files via my laptop. The bad thing that i did is that i formated everything in my mobile (as you can see and my IMEI too) to make a clear installation of a new rom after the brick. When i entered my new ROM i realized that i have everything apart from my IMEI. So that i do not have any network-signal in my mobile but a connection to Wifi
The program Dfs CDMA tools and Octopus Box does not work in my desktop. (Any idea?)
Do you have any idea how to repair it? I read that there is a folder (nfs i suppose that encode inside the IMEI). So, if someone find this folder can upload it somewhere? Probably will find a solution to solve it.
i was solved problem with no imei :
make full buckup from TWRC in another LS980
restored that buckup in bricked phone (make first buckup on it, to know name of folder, and take to that folder buckup from work phone)
sorry for me English
http://forum.xda-developers.com/showthread.php?p=51430443
SPASuka said:
i was solved problem with no imei :
make full buckup from TWRC in another LS980
restored that buckup in bricked phone (make first buckup on it, to know name of folder, and take to that folder buckup from work phone)
sorry for me English
http://forum.xda-developers.com/showthread.php?p=51430443
Click to expand...
Click to collapse
Are you sure that this works in all devices of LG G2?

Network Connection Error

Alright, so I paid cellunlocker to unlock a new to me Note 3. Not blacklisted, everythings good on that end.
my IMEI shows as the correct number with two extra digits - not sure if thats my issue.
However I cannot connect to any mobile network. Well thats not true, I can see I'm connected to their tower but cannot get any phone calls, texts I just get the message on the screen.
I didn't back up my EFS partition, having 6 android phones so far all, rommed, and everything I never had to do that.
I understand its likely that this partition is messed up.
.. So how can I restore it?
I'm rooted, I'll install a recovery I don't mind any of that. however I do not have a backup of my EFS partition. Is there any way to extract this from a stock file?
Can I just use Kies or something to flash the entire software and restore this partition?
Seeking some guidance from the Note Experts.
Thanks,
KeirP said:
Alright, so I paid cellunlocker to unlock a new to me Note 3. Not blacklisted, everythings good on that end.
my IMEI shows as the correct number with two extra digits - not sure if thats my issue.
However I cannot connect to any mobile network. Well thats not true, I can see I'm connected to their tower but cannot get any phone calls, texts I just get the message on the screen.
I didn't back up my EFS partition, having 6 android phones so far all, rommed, and everything I never had to do that.
I understand its likely that this partition is messed up.
.. So how can I restore it?
I'm rooted, I'll install a recovery I don't mind any of that. however I do not have a backup of my EFS partition. Is there any way to extract this from a stock file?
Can I just use Kies or something to flash the entire software and restore this partition?
Seeking some guidance from the Note Experts.
Thanks,
Click to expand...
Click to collapse
- The extra 2 digits after the IMEI is the IMEISV. It is not the issue.
- The EFS partition is store inside your device, not in the stock firmware. Of course you can not extract it from the stock files.
- You can try to flash the entire stock firmware (using Kies or Odin). Sometime that may help to fix the problem.
Appears to be a case of delayed blacklist or something.
Didn't show up in any searches and not to my carrier, yet later now it does appear it is.
Now to return it to the carrier so they can get it back to the owner, and to track down the ass I bought it from.

A8 IMEI Missing

I have a Galaxy A8 (SM-A800F), bought from India.
According to my dad, he left the phone to download & update over night, but in the morning the phone was off, as battery was drained off. But when the phone was switched on, it stopped receiving network signal & does not show any IMEI number. I did a factory reset from recovery but that too didn't help.
Screenshot is attached
Any help would be appreciated
anupampb said:
I have a Galaxy A8 (SM-A800F), bought from India.
According to my dad, he left the phone to download & update over night, but in the morning the phone was off, as battery was drained off. But when the phone was switched on, it stopped receiving network signal & does not show any IMEI number. I did a factory reset from recovery but that too didn't help.
Screenshot is attached
Any help would be appreciated
Click to expand...
Click to collapse
Maybe just a bad install because the battery died, install the stock firmware again.
ashyx said:
Maybe just a bad install because the battery died, install the stock firmware again.
Click to expand...
Click to collapse
I'm trying to do that but wherever I'm finding the files, download speed is limited & downloading fails after 30min or so
My father gave it to service centre once, they told that they re installed the firmware(as claimed by them). The phone worked well for 3 days, then again same thing
anupampb said:
I'm trying to do that but wherever I'm finding the files, download speed is limited & downloading fails after 30min or so
My father gave it to service centre once, they told that they re installed the firmware(as claimed by them). The phone worked well for 3 days, then again same thing
Click to expand...
Click to collapse
I flashed the stock firmware but no luck, still no IMEI
anupampb said:
I flashed the stock firmware but no luck, still no IMEI
Click to expand...
Click to collapse
Loss of imei and baseband usually means a corrupt EFS partition.
The EFS partition does contain a backup, but if that got wiped also then there is no way to restore it.
You will need root and a root file explorer for this.
If you delete the EFS folder it will give you a default imei.
However before doing anything it is important to backup the EFS first.
You can do this with twrp or just copy and paste the EFS folder to the sdcard.
The EFS folder contains nv_data.bin and nv_data.bin.md5.
Delete these and it will be replaced by the backup after reboot.
If that doesn't work try deleting the whole folder (after making a backup) then reboot.

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