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MG9 to MG5 firmware, losing imei

Hi there,
I'm just wondering why my phone is losing its imei (or rather, its changing to the generic 0049xxx) after flashing the latest MG5 firmwares (I tried three different versions now). I first came from MG1, then flashed the MG9 when it came out. Now, when I flash any other firmware, my imei gets f'ed up.
I havent rooted my phone yet, I'm just flashing firmwares I downloaded from sammobile. Is it just because of this MG5 firmwares not being compatible? Will I still be able to flash newer firmwares when it goes out?
Thanks in advance, cheers!

Bump...

tclocki said:
Bump...
Click to expand...
Click to collapse
I have downloaded the August version for the united arab emirates , it seems to see my imei , but whenever i lock the phone (or screen idle closes the display) 90% of times phone freezes and I need to restart it.

it seems that in the latest roms samsung(for S3,S4) change the efs structure ... thats why imei gets mess if you try to change rom after.but if you change the modem with old one it may works....

Gotcha thanks!

i have the similar problem .
updated from G1 to G5 via samobile,
same problem ... no network registration
..
since i was rooted i used cutsom rom legend and crash . working fine for the moment \
but i need to solve this issue if i want go on stock
BTW i have some EFS back up folder can it help in recovering the IMEI issue
also how to CHANGE THE MODEM WITH OLD ONe ????

Hello same problem with installing firmware from MG9 to MG5, the imei resets to 0049000 something, did you find solution to it. Please reply. Thanks in advance.

mihir880 said:
i have the similar problem .
updated from G1 to G5 via samobile,
same problem ... no network registration
..
since i was rooted i used cutsom rom legend and crash . working fine for the moment \
but i need to solve this issue if i want go on stock
BTW i have some EFS back up folder can it help in recovering the IMEI issue
also how to CHANGE THE MODEM WITH OLD ONe ????
Click to expand...
Click to collapse
kunal.bodke said:
Hello same problem with installing firmware from MG9 to MG5, the imei resets to 0049000 something, did you find solution to it. Please reply. Thanks in advance.
Click to expand...
Click to collapse
who flashed the MG9 firmware had their EFS partition modified.
So in case if you have to go back to earlier firmware you will have problems with IMEI. You have to:
- Restore EFS (that is backed up before this change) or
- Flash MG9 modem which can still read the modified EFS.
see here for modem collection http://forum.xda-developers.com/showthread.php?t=2192025

samersh72 said:
who flashed the MG9 firmware had their EFS partition modified.
So in case if you have to go back to earlier firmware you will have problems with IMEI. You have to:
- Restore EFS (that is backed up before this change) or
- Flash MG9 modem which can still read the modified EFS.
see here for modem collection http://forum.xda-developers.com/showthread.php?t=2192025
Click to expand...
Click to collapse
Flashing or restoring efs backup doesnt work after flashing mg9.
You need to return to your firmware when you first get your phone out of the box with clean install and wiping everything in cwm before getting into download mode.
Then after flashing the firmware, root then restore efs backup.
Sent from my GT-I9500 using xda app-developers app

marc_ecko28 said:
Flashing or restoring efs backup doesnt work after flashing mg9.
You need to return to your firmware when you first get your phone out of the box with clean install and wiping everything in cwm before getting into download mode.
Then after flashing the firmware, root then restore efs backup.
Sent from my GT-I9500 using xda app-developers app
Click to expand...
Click to collapse
so what is new
once you flashed the MG9, the efs partition format has been changed, so if you downgrade (regardless if to the original stock) you must restore the efs partition from the backup you made or just flash MG9 modem.

samersh72 said:
so what is new
once you flashed the MG9, the efs partition format has been changed, so if you downgrade (regardless if to the original stock) you must restore the efs partition from the backup you made or just flash MG9 modem.
Click to expand...
Click to collapse
Guys, If I flash with MG5 firmware and then flash with modem of MG9? Will it work ?

[Q] PLEASE HELP "IMEI null/null" exynos n900

Galaxy note 3 sm-n900 kk 4.4.2 n900xxudnc1 official problem imei null/null
are there a solution ??
Repair is possible ??
I readed here in this forum that there's soluttion to make dowgrade to jb 4.3 some one can write the steps to do that if it's possible ??
Please heeeelp !! Thanks to all... :good: :good:
:crying: :crying:

Sorry bro I have no idea what u are talking about. But one thing I can answer the downgrade from 4.4 to 4.3 is not possible by now if. What exactly happened?

4aces said:
Sorry bro I have no idea what u are talking about. But one thing I can answer the downgrade from 4.4 to 4.3 is not possible by now if. What exactly happened?
Click to expand...
Click to collapse
baseband version unknown after upgrade to 4.4.2 via odin (1 month a go), no gsm network no sim detect, imei lost.

wissàm1981 said:
Galaxy note 3 sm-n900 kk 4.4.2 n900xxudnc1 official problem imei null/null
are there a solution ??
Repair is possible ??
I readed here in this forum that there's soluttion to make dowgrade to jb 4.3 some one can write the steps to do that if it's possible ??
Please heeeelp !! Thanks to all... :good: :good:
:crying: :crying:
Click to expand...
Click to collapse
Did you backup efs? If you did restore it. If not then try flashing this in recovery.. Or try flashing stock again.
http://forum.xda-developers.com/showthread.php?t=2507403
4aces said:
...But one thing I can answer the downgrade from 4.4 to 4.3 is not possible by now if...
Click to expand...
Click to collapse
Actually it IS possible for the n900, the knox reset also let's users downgrade if they so choose to.. But he doesn't need to downgrade, he lost his efs/imei and that can be fixed if he made a backup or by using the other options that I listed.
http://forum.xda-developers.com/showthread.php?p=52329946&nocache=1

Thanks 4 correcting me, I didn't know. I have the N9005 so... learned something

Khizar said:
Did you backup efs? If you did restore it. If not then try flashing this in recovery.. Or try flashing stock again.
http://forum.xda-developers.com/showthread.php?t=2507403
Click to expand...
Click to collapse
thanks bro, no backup efs.
Actually it IS possible for the n900, the knox reset also let's users downgrade if they so choose to.. But he doesn't need to downgrade, he lost his efs/imei and that can be fixed if he made a backup or by using the other options that I listed.
http://forum.xda-developers.com/showthread.php?p=52329946&nocache=1
Click to expand...
Click to collapse
please how to make a safe downgrade?? i think that can fix the problem, i have not an efs backup & flashing roms don't solve (i did that many time) same result "unknown baseband version"!! thanks bro, knox warranty void 0 samsung official.

Downgrade to jb 4.3 successful!! thanks you RuchRha you are great man!
http://forum.xda-developers.com/showthread.php?t=2642207&page=9
but my phone still baseband unknown & imei null/null

wissàm1981 said:
Downgrade to jb 4.3 successful!! thanks you RuchRha you are great man!
http://forum.xda-developers.com/showthread.php?t=2642207&page=9
but my phone still baseband unknown & imei null/null
Click to expand...
Click to collapse
Do not try to recover EFS...
It is not the problem, the problem is that you have unknown baseband (Modem damage)... Please check if it can mount /EFS folder (Check in recovery)
It it fails to mount /EFS, then you will probally need to find someone with a Asansam box to fix it...
Remember to backup you EFS folder
Best regards

Ratata82 said:
Do not try to recover EFS...
It is not the problem, the problem is that you have unknown baseband ()... Please check if it can mount /EFS folder (Check in recovery)
It it fails to mount /EFS, then you will probally need to find someone with a Asansam box to fix it...
Remember to backup you EFS folder
Best regards
Click to expand...
Click to collapse
please how to do that (mount /EFS), i have not an efs backup
Modem damage that mean phone does not accept any modem version via odin or via recovery ??
Thanks a lot,
Best regards,

wissàm1981 said:
please how to do that (mount /EFS), i have not an efs backup
Modem damage that mean phone does not accept any modem version via odin or via recovery ??
Thanks a lot,
Best regards,
Click to expand...
Click to collapse
IMEI null/null comes from modem failure. It is not because your EFS is wiped, if your EFS was wiped, then you would get a generic IMEI number 0044.....
But try to go to recovery, do you get "failed to mount /EFS"
But your IMEI null/null could also be a hw failure...
But I would try to flash a 4 part 4.4.2 firmware
Remember to backup your EFS, it is not corrupted...

Ratata82 said:
IMEI null/null comes from modem failure. It is not because your EFS is wiped, if your EFS was wiped, then you would get a generic IMEI number 0044.....
But try to go to recovery, do you get "failed to mount /EFS"
But your IMEI null/null could also be a hw failure...
But I would try to flash a 4 part 4.4.2 firmware
Remember to backup your EFS, it is not corrupted...
Click to expand...
Click to collapse
i did a mount /EFS from recovery but no msg "failed to mount /EFS" no thing,
i think my EFS is corrupted or wiped !! how to verify that ?? thanks

wissàm1981 said:
i did a mount /EFS from recovery but no msg "failed to mount /EFS" no thing,
i think my EFS is corrupted or wiped !! how to verify that ?? thanks
Click to expand...
Click to collapse
IMEI null/null has nothing to do with a wiped EFS. It is modem problem, or HW failure. I would start flashing a 4 part firmware, eg this one
https://mega.co.nz/#!f9BxWSzK!O-3wPSJIeuhuIfwRYaPPmjxc4w1OmKxBE826sSCdAz8
Keep us updated
Best regards

fix imei note 3 n900
My phone is note 3 kk sm-n900
I faced this problom and i found solution
Throug tool named (((GSII-REPAIRE))))
in google play first you have to :
1. Root your phone
2.install busybox
3.downlaod and install GSII-REPAIER
4.CLICK REPIER IN THE APP (MOUNT)
5.Hoha now enjoy your imei the real one is back and the network
Best regards
Amara
Libya

worked like charm
7moda said:
My phone is note 3 kk sm-n900
I faced this problom and i found solution
Throug tool named (((GSII-REPAIRE))))
in google play first you have to :
1. Root your phone
2.install busybox
3.downlaod and install GSII-REPAIER
4.CLICK REPIER IN THE APP (MOUNT)
5.Hoha now enjoy your imei the real one is back and the network
Best regards
Amara
Libya
Click to expand...
Click to collapse
thanx a lot saved me and my note 3

i cannot it say
you dony have .nv_data.bak and his md5 files , canceled
what i do???????
please help

No anyone to help me?

Hi friends. I am new to xda. I have same problem last 4 months. I have tried flash different stock roms but no use. When i check phone info it showing
Original CSC is INU. But showing other CSC is THL (wrong). Modem is blank. SW Version is unknown. My guess is modem and csc related issue. I have tried flash modem, but not affected. CSC also not affected. Why this happen?

IMEI. Restore backed up EFS folder .
Sent from my SM-N930F using XDA-Developers mobile app

[Q] please help me ...please... please

Please help me about my phone note3 sm-n900 3g i was install vn build 14 kitkat rom and i change to dr-ketan rom version 9 and lost network and idont known wt im doing
So please hlp me and sorry for my bad language

re: network and other issues
dul-faqar said:
Please help me about my phone note3 sm-n900 3g i was install vn build 14 kitkat rom and i change to dr-ketan rom version 9 and lost network and idont known wt im doing
So please hlp me and sorry for my bad language
Click to expand...
Click to collapse
If you don't know what you are doing my advice would be to
go to http://SamMobile.com and download the official kitkat
4.4.2 SM-900 firmware and flash it using Odin.
Be sure to do a full wipe including system, data, cache, dalvik
and last but not least a factory reset in twrp or cwm recovery
before you start the odin flash.
You will need to re-root your phone afterwards and install twrp
or cwm recovery. This is the surest way to resolve your network
and other issues.
This will give you a fresh clean start.

This will solve it.
Do you have twrp or cwm backup.
if not reflash VN rom 14.1 and you should get it back. secondly you can flash the modem attached.
1. wipe the device including internal memory in the twrp memory. put the phone in download mode. flash the modem via cwm rcovery
2. go back to recovery do just a factory reset.
3 now get any 4.4.2 stock rom for your region from sammobile and flash it using odin.
when the phone is rebooting and you see the Samsung logo pull the battery. put the battery back, go back to recovery do a factory reset. then let the boot complete.
it should be fine.
if it help don't forget to press thanks

Hello
mithudas28 said:
Do you have twrp or cwm backup.
if not reflash VN rom 14.1 and you should get it back. secondly you can flash the modem attached.
1. wipe the device including internal memory in the twrp memory. put the phone in download mode. flash the modem via cwm rcovery
2. go back to recovery do just a factory reset.
3 now get any 4.4.2 stock rom for your region from sammobile and flash it using odin.
when the phone is rebooting and you see the Samsung logo pull the battery. put the battery back, go back to recovery do a factory reset. then let the boot complete.
it should be fine.
if it help don't forget to press thanks
Click to expand...
Click to collapse
Hello, How do I reflash the vn? I am new to samsung phones? can you point me in the right direction? how do you do a cwn recovery? i already downloaded the firmware from my region and odin.

dul-faqar said:
Please help me about my phone note3 sm-n900 3g i was install vn build 14 kitkat rom and i change to dr-ketan rom version 9 and lost network and idont known wt im doing
So please hlp me and sorry for my bad language
Click to expand...
Click to collapse
try to flash a new kernel might solve the problem

omarluna2 said:
Hello, How do I reflash the vn? I am new to samsung phones? can you point me in the right direction? how do you do a cwn recovery? i already downloaded the firmware from my region and odin.
Click to expand...
Click to collapse
sorry didn't understand you I was answering the op.
if you flashed vn rom earlier you should just do it again. just make sure you do a factory reset , and dalvik wipe.
If you need further help just look in the vn-rom thread for flashing procedure. anyway
here it is
http://forum.xda-developers.com/showthread.php?t=2503206
for more info on rooting and getting custom recovery search xda note 3 forum

mithudas28 said:
sorry didn't understand you I was answering the op.
if you flashed vn rom earlier you should just do it again. just make sure you do a factory reset , and dalvik wipe.
If you need further help just look in the vn-rom thread for flashing procedure. anyway
here it is
http://forum.xda-developers.com/showthread.php?t=2503206
for more info on rooting and getting custom recovery search xda note 3 forum
Click to expand...
Click to collapse
*****
*****
*****
im lost my imei and network and not save efs backup in my phone or ext.memory and i found away to recover my original imei and resolve this
/*/*/*/*/*/*/*/*/
thank you for every one comment on my problem
at last sorry for my bad language
:good::good::good:

dul-faqar said:
*****
*****
*****
im lost my imei and network and not save efs backup in my phone or ext.memory and i found away to recover my original imei and resolve this
/*/*/*/*/*/*/*/*/
thank you for every one comment on my problem
at last sorry for my bad language
:good::good::good:
Click to expand...
Click to collapse
happy for you.
well how did you manage it ?? please explain .
I have a similar problem but quite complicated not related to vn rom.

mithudas28 said:
happy for you.
well how did you manage it ?? please explain .
I have a similar problem but quite complicated not related to vn rom.
Click to expand...
Click to collapse
in the begining format my phone and enter to download mode and install official rom consist of four files {MODEM+CSC+BOOTLOADER+PDA}
after turn on my phone doing root CWM and install:_
1-for ur phone use terminal emulator,busy box,super su
2-for ur pc use EFS Professional ....turn on EFS Professional and choice EFS Professional and ok then let him connect with ur phone and automatic download efs ..just wait few second ur phone will be ok and same imei in the phone back
sorry for my bad language
if it help don't forget to press thanks

dul-faqar said:
in the begining format my phone and enter to download mode and install official rom consist of four files {MODEM+CSC+BOOTLOADER+PDA}
after turn on my phone doing root CWM and install:_
1-for ur phone use terminal emulator,busy box,super su
2-for ur pc use EFS Professional ....turn on EFS Professional and choice EFS Professional and ok then let him connect with ur phone and automatic download efs ..just wait few second ur phone will be ok and same imei in the phone back
sorry for my bad language
if it help don't forget to press thanks
Click to expand...
Click to collapse
will try an let you know hope this works never tried efs professional. well did you have a backup with efs professional or it just worked by itself downloading some files from the internet

mithudas28 said:
will try an let you know hope this works never tried efs professional. well did you have a backup with efs professional or it just worked by itself downloading some files from the internet
Click to expand...
Click to collapse
no no no just worked by itself downloading some files from the internet ihave not any backup on my phone or ext.memory

[Q] Galaxy note 3 sm-n900 repair imei without efs backup

Hello everybody, I have a galaxy note 3 sm-n900 and I have flashed another rom on my phone ,
but what I have got is null imei and I don't have any backup for efs file
I have tried to flash a stock rom but still have the same problem.
All what I want is a simple way to re-enter my IMEI that I have under my battery into my note 3.

mo.programmer said:
Hello everybody, I have a galaxy note 3 sm-n900 and I have flashed another rom on my phone ,
but what I have got is null imei and I don't have any backup for efs file
I have tried to flash a stock rom but still have the same problem.
All what I want is a simple way to re-enter my IMEI that I have under my battery into my note 3.
Click to expand...
Click to collapse
There is no simple way to enter the IMEI manually.
After flashing stock rom, try to reflash the modem (baseband) 1 or 2 times more.
Does the baseband stick after flashing? Check the Baseband Version with Phone INFO ★Samsung★ app (under FIRMWARE INFO section).

Re-flash stock rom and modem
vndnguyen said:
After flashing stock rom, try to reflash the modem (baseband) 1 or 2 times more.
Does the baseband stick after flashing? Check the Baseband Version
Click to expand...
Click to collapse
I need a way to patch my IMEI .
But if I have to flash stock rom how I can determine which version because I have lost mobile info after this operation,
and how I can reset efs if I want that.

mo.programmer said:
I need a way to patch my IMEI .
But if I have to flash stock rom how I can determine which version because I have lost mobile info after this operation,
and how I can reset efs if I want that.
Click to expand...
Click to collapse
As you can see in the screenshots, your baseband is null so you have to flash the modem or the stock firmware again.
The screenshot shows your original CSC is KSA (Saudi Arabia). Try to download this stock firmware and flash again.
Open Phone INFO ★Samsung★ app > Menu > 'Firmware Browser' > enter KSA into the CSC textbox > tap Go button to search for the firmware.

vndnguyen said:
As you can see in the screenshots, your baseband is null so you have to flash the modem or the stock firmware again.
The screenshot shows your original CSC is KSA (Saudi Arabia). Try to download this stock firmware and flash again.
Open Phone INFO ★Samsung★ app > Menu > 'Firmware Browser' > enter KSA into the CSC textbox > tap Go button to search for the firmware.
Click to expand...
Click to collapse
Actually I have flashed KSA rom on my phone and tried more than one stock rom ,and I have tried to flash five different modem files that I have found on the internet but nothing have changed, and that is the reason why I want a way to batch my IMEI because flashing new stock rom and new modem file have no sense.
Pleeeeeeeease Help I'm in need for solution.

mo.programmer said:
Actually I have flashed KSA rom on my phone and tried more than one stock rom ,and I have tried to flash five different modem files that I have found on the internet but nothing have changed, and that is the reason why I want a way to batch my IMEI because flashing new stock rom and new modem file have no sense.
Pleeeeeeeease Help I'm in need for solution.
Click to expand...
Click to collapse
OK no problem.
The problem now is that your baseband is NULL, so you must reflash a vaild baseband.
Follow this instruction: http://forum.xda-developers.com/galaxy-note-3/general/ref-galaxy-note-3-sm-n9005-gsm-modems-t2842806

vndnguyen said:
OK no problem.
The problem now is that your baseband is NULL, so you must reflash a vaild baseband.
Follow this instruction: http://forum.xda-developers.com/galaxy-note-3/general/ref-galaxy-note-3-sm-n9005-gsm-modems-t2842806
Click to expand...
Click to collapse
It's for sm-n9005. Don't flash that modem on sm-n900.
Sent from my SM-N900 using Tapatalk

mo.programmer said:
Actually I have flashed KSA rom on my phone and tried more than one stock rom ,and I have tried to flash five different modem files that I have found on the internet but nothing have changed, and that is the reason why I want a way to batch my IMEI because flashing new stock rom and new modem file have no sense.
Pleeeeeeeease Help I'm in need for solution.
Click to expand...
Click to collapse
Flash this modem."N900_XXUENE1_MODEM_CWM"
Need a file?pm me.
Sent from my SM-N900 using Tapatalk

meetpatel said:
It's for sm-n9005. Don't flash that modem on sm-n900.
Sent from my SM-N900 using Tapatalk
Click to expand...
Click to collapse
I mean the instruction to flash the modem. The OP should find the proper modem by himself.
Sent from my SM-N9005 using Tapatalk

unfortunately
meetpatel said:
Flash this modem."N900_XXUENE1_MODEM_CWM"
Need a file?pm me.
Sent from my SM-N900 using Tapatalk
Click to expand...
Click to collapse
unfortunately,none of the above solution have worked for me
1. should I flash a specific stock rom for sm-n900 (how I can determine which one because I have lost the original information)
2. should I try to clear EFS with odin ( when try to flash modem).
3. should I try a custom rom that make sense for this kind of problems ( help to choose !!!).
4. should I apply an update a zip file from CWM mode ( which file should I Use)
5. Is there any ADB command that can batch my IMEI.
6. Is it useful to take EFS backup from another note 3 sm-n900 (what I have to do after that).
I feel so lost, I need a help PROFESSIONAL

Tried this? Worked for me.
http://forum.xda-developers.com/showthread.php?t=2507403

Finally got the solution
Dear all thanks for everyone who try to help me
I have got the solution for my problem
1- just try to flash a stock rom for note 3.
2- and then root it.
3- delete the efs folder.
4- reboot the phone.

mo.programmer said:
Dear all thanks for everyone who try to help me
I have got the solution for my problem
1- just try to flash a stock rom for note 3.
2- and then root it.
3- delete the efs folder.
4- reboot the phone.
Click to expand...
Click to collapse
How can you restore the IMEI by deleting the EFS folder?

IMEI
vndnguyen said:
How can you restore the IMEI by deleting the EFS folder?
Click to expand...
Click to collapse
I have not restored it, but I got a new IMEI , now my wireless work, and the baseband appear.

mo.programmer said:
Dear all thanks for everyone who try to help me
I have got the solution for my problem
1- just try to flash a stock rom for note 3.
2- and then root it.
3- delete the efs folder.
4- reboot the phone.
Click to expand...
Click to collapse
How can I delete efs folder ?
can you give a details, thanks

hi everyone my mobile note 3 exynos imei null and baseband unknown how to repair imei can anyone help me.

As per multiple threads restore your backed up EFS folder.
OR Read this thread
Or try flashing stock firmware via Odin .

bro i have flashed two times with odin and flash v4.3 also but not got any solution ,
bro if you know about any tool for repair or restore imei of this device please tell me,
i am trying to repair imei with z3x tool but in this tool not showing n900 exynos model.

Suggest a phone repair shop.
Illegal methods of IMEI fixes etc are not allowed on XDA .

Thanks for your suggestion
but i am a hardware mechanic and i am trying to learn software for better experience THANKS

[Q] HELP NOTE 3 N900 UNKNOWN BASEBAND, NULL IMEI completely out of Nowhere!

Hello Fellas, am posting here as I haven't found help elsewhere. Kindly Respond to my woes. I have a rooted Galaxy Note 3 N900 running official Lollipop with IMEI Null/Null and No Baseband version. The IMEI just disappeared totally out of the blue as no custom ROM has been flashed on the device!! This has happened 2 months after updating from 4.3 Jelly bean. With no prior EFS Backup here's what I have tried:
1. EFS Professional (backup&restore complete but no luck)
2. EFS Restore express ( backup.bat>Odin restore)
3. GSII Repair tool
After hitting no luck with the above tools and without any "/EFS mount errors" in recovery either and WIFI working fine, I came to a conclusion that most probably the EFS folder partition on my Note 3 is still intact and most probably this could be a case of a bad modem which would explain the loss of Baseband Version and thus the Null IMEI. So I tried flashing back to KitKat with N900XXUENG1 firmware and separately flashed a few modems compatible with Samsung's new EFS System: N900XXUENG1_MODEM, N900_XXUENF2_MODEM_CWM and also gave a shot at recommended N900_XXUENE1_MODEM_CWM.ZIP which seems to restore baseband for many users with this issue but this failed as well. After much searching I found a 4file_N900XXUGBNL8 Lollipop Firmware with PIT from Dev-Host, flashed all files in Odin&even repartitioned the device but still no baseband!!! WIFI&everything else runs smooth except the damn baseband/Null IMEI! Almost Exhausted my options...
Now I trust we have some informed members and developers here, NEED YOUR VALUABLE IDEAS HERE mates! Someone, anyone.....Thanks!

Have got any guarantee of the device?If so,send it to service ıf your guarantee continiues.
If you bought the device from another country,This may occur ıf you didn't register it.(In my country this is how it works.Turkey)
Or someone cloned your imei,check your imei ıf it is valid.
This is not because you upgraded your device to android 5.
If ıt was the case,you would have already faced the problem after just the flash.
I would say flash another modem
But,You say you tried flashing other modems.So no luck with that.
I had seen s3 with the same problem.I had flashed a modded modem.
It worked.I dont know if there is one for your device.
Briefly this is an imei/modem problem.
I don't know ıf the suggestions above help you.
I hope so.
Good luck.

try flashing stock rom from sammobile via odin. you need to backup efs folder everytime you flash a new rom, that's my opinion. may be wrong.

I think I used to had this problem with my Note 2 as well. If you come from 4.3 you should flash stock ROM Jelly bean 4.3 from Sammobile or Samsung-updates website. Then flash lollipop 5.0 over 4.3 when you can see your IMIE. Maybe it will work.

So. If u in L bootloader. U must! Flash the L modem that sometimes didnt get flashed by the odin while flashing stock rom. So just extract the modem.img and things for modem. Then just flash it using dd command or make flashable zip. Then it works fine. I have it on s4 exynos. That if i in L bootloader then even i install kitkat rom with L bootloader. U must still flash the L modem. K. Hope it works

1. İf you couldnt recover with efs professional , probably you've been lost your original imei files like nv_data.bin etc. and there is no backup...
2. So try to remake this kind of files with-again- with efs professional. But there is not so much info about this "creation" process.
3. I had the same situation. . . . And i'm still sorry. . . ( . . . The other solution is JTAG, more easy, cheaper in total and psychologicaly healty !!!)
GOOD LUCK....

m6112 said:
1. İf you couldnt recover with efs professional , probably you've been lost your original imei files like nv_data.bin etc. and there is no backup...
2. So try to remake this kind of files with-again- with efs professional. But there is not so much info about this "creation" process.
3. I had the same situation. . . . And i'm still sorry. . . ( . . . The other solution is JTAG, more easy, cheaper in total and psychologicaly healty !!!)
GOOD LUCK....
Click to expand...
Click to collapse
All EFS folder files are present including nv_data.bak&.bin Am a bit reserved to go the JTAG way just yet.

white7561 said:
So. If u in L bootloader. U must! Flash the L modem that sometimes didnt get flashed by the odin while flashing stock rom. So just extract the modem.img and things for modem. Then just flash it using dd command or make flashable zip. Then it works fine. I have it on s4 exynos. That if i in L bootloader then even i install kitkat rom with L bootloader. U must still flash the L modem. K. Hope it works
Click to expand...
Click to collapse
Thanks for that but as I already said I was lucky to find a 4file partitioned Lollipop ROM with separate modem. Flashed that through Odin and even repartitioned the device but that hit a rock as well!

longcoming said:
Have got any guarantee of the device?If so,send it to service ıf your guarantee continiues.
If you bought the device from another country,This may occur ıf you didn't register it.(In my country this is how it works.Turkey)
Or someone cloned your imei,check your imei ıf it is valid.
This is not because you upgraded your device to android 5.
If ıt was the case,you would have already faced the problem after just the flash.
I would say flash another modem
But,You say you tried flashing other modems.So no luck with that.
I had seen s3 with the same problem.I had flashed a modded modem.
It worked.I dont know if there is one for your device.
Briefly this is an imei/modem problem.
I don't know ıf the suggestions above help you.
I hope so.
Good luck.
Click to expand...
Click to collapse
It's an old device, no warrants. Am indeed looking at the possibility of someone else allocating the IMEI to their device, though i doubt. But if that was the case shouldn't the Baseband at least be present?

Did you try downgrading to 4.3 with official stock files?
If not,give it a shot.

Droidsan said:
It's an old device, no warrants. Am indeed looking at the possibility of someone else allocating the IMEI to their device, though i doubt. But if that was the case shouldn't the Baseband at least be present?
Click to expand...
Click to collapse
I have explained it earlier, Actually it is kernel. Newer kernel makes some changes on EFS partition and that changes can not be read by old kernel but in this case once you flash newer modem it will be solved. If your issue doesn't solved by flashing latest stock ROM then only possibility is messed up EFS partition and for that you must have a backup which was created when your device was normal. If your EFS partition is corrupted and you don't have backup then i think only option you have is to go to service station they can repair it easily. Though your device is not under warranty but you have official bill then still they can do it with paid service. Now a days samsung have changed policy and restoring IMEI they needs to do it online with samsung server (this information I got from service center owner in my city who is my friend and he did same for one of my friend)

UPDATE:
dr.ketan said:
I have explained it earlier, Actually it is kernel. Newer kernel makes some changes on EFS partition and that changes can not be read by old kernel but in this case once you flash newer modem it will be solved. If your issue doesn't solved by flashing latest stock ROM then only possibility is messed up EFS partition and for that you must have a backup which was created when your device was normal. If your EFS partition is corrupted and you don't have backup then i think only option you have is to go to service station they can repair it easily. Though your device is not under warranty but you have official bill then still they can do it with paid service. Now a days samsung have changed policy and restoring IMEI they needs to do it online with samsung server (this information I got from service center owner in my city who is my friend and he did same for one of my friend)
Click to expand...
Click to collapse
Thank you Dr.Ketan for that information. You have been a great help to many. I have followed your posts about this issue and I feel there is still hope.
UPDATE:
I WAS ABLE TO RESTORE THE BASEBAND AND NOW THE IMEI IS GENERIC, READS 004999010640000. [/B] I was able to restore nv_data backup from /Efs folder and deleting bad nv_data. Here's what I did:
Using root Explorer in /EFS:
Deleted corrupt files;
nv_data.bin ( 18 April 2015)
nv_data.bin.md5 (18 April 2015)
Renamed backup files (dated 31 Jan 2015) to apply;
.nv_data.bak > nv_data.bin
.nv_data.bak.md5 > nv_data.bin.md5
Using ADB shell:
Code:
adb shell
su
umount /efs
mke2fs /dev/block/mmcblk0p3
mount -w -t ext4 /dev/block/mmcblk0p3 /efs
Reboot
However, the baseband and generic IMEI come&go across reboots and seems not to stick permanently. Any possible steps from here???

NOTE: Previously I have been able to restore Unknown Baseband and Null IMEI in Galaxy S2 i9100 using the above adb method (Code Only) http://www.selftechgenius.com/?p=284

NOTE: Previously I have been able to restore Unknown Baseband and Null IMEI in Galaxy S2 i9100 using the above adb method (Code Only) http://www.selftechgenius.com/?p=284

Try this out
I always have that problem when I downgrade to jellybean but solving it is easy. Just flash THIS modem file under the AP option Odin. Tell me if it works.

Muthumbi said:
I always have that problem when I downgrade to jellybean but solving it is easy. Just flash THIS modem file under the AP option in odin mode. Tell me if it works.
Click to expand...
Click to collapse
If flashing modem via Odin you MUST turn off the phone then start it in DL mode. Simply doing a 'reboot' into DL mode will not let the modem be flashed.