Galaxy S2 EFS no backup - General Questions and Answers

hey all, I've got an S2 in at the moment that has lost its important EFS data. Flashed it with odin with the re-partition ticked (I believe) and don't hae a backup. Is there any way to get this sorted. I've tried a few things but to no avail yet. I have micro-box and Z3X which allows a repair IMEI but it isn't having it. It's currently on 2.3.5. is it best to update to ICS?

try this method
check it out and see if it help you http://forum.xda-developers.com/showthread.php?t=1804123 :highfive:
Hope if it work for you remmeber to thanks :good:

Related

IMEI and EFS folder ?helpful? information

Hi
The other day I messed up my Gtab P1000 by going from CM10.2 back to CM9.1, it deleted my IMEI etc. I ended up with null or fake IMEI numbers
I tried this method first
http://forum.xda-developers.com/showthread.php?t=1264021
but it did not work.
I put the nv.data.bak and md5.bak I made by doing those instructions in that guide away and forgot about them.
Then went on a tour of the net trying to get tools and info
I tried loads, efs pro....sdk tools...qpst...imei writers....plus others, but nothing alone would work.
What I had to do was:
Download a stock rom for my country (GB V5 would not work, had to be stock for me)
Start odin 1.85
Flash stock rom, mr.pit and modem from the GB V5 stock safe rom in download mode
Start up
Root it
Put the nv.data.bak and its md5 that you made earlier into SD card
Download root explorer and start it
Copy the files over to your phones efs folder
start up EFS pro
Click back up/restore
Restore from internal back up. reboot aaaaaaaaaaand finally, after days of trying, it was fixed
As I say EFS alone would not work, and the 9 easy steps guide alone would not work for me, The way I did it also would not work with the stock GB V5. I don't know why. All I know is I had to use Stock UK rom from samsung website with the back up made from the guide and EFS pro
Hope that helps some of you. Or someone can put it somewhere that it can be helpful. Use my instructions as you see fit.
Cheers
Dazz71 said:
Hi
The other day I messed up my Gtab P1000 by going from CM10.2 back to CM9.1, it deleted my IMEI etc. I ended up with null or fake IMEI numbers
I tried this method first
http://forum.xda-developers.com/showthread.php?t=1264021
but it did not work.
I put the nv.data.bak and md5.bak I made by doing those instructions in that guide away and forgot about them.
Then went on a tour of the net trying to get tools and info
I tried loads, efs pro....sdk tools...qpst...imei writers....plus others, but nothing alone would work.
What I had to do was:
Download a stock rom for my country (GB V5 would not work, had to be stock for me)
Start odin 1.85
Flash stock rom, mr.pit and modem from the GB V5 stock safe rom in download mode
Start up
Root it
Put the nv.data.bak and its md5 that you made earlier into SD card
Download root explorer and start it
Copy the files over to your phones efs folder
start up EFS pro
Click back up/restore
Restore from internal back up. reboot aaaaaaaaaaand finally, after days of trying, it was fixed
As I say EFS alone would not work, and the 9 easy steps guide alone would not work for me, The way I did it also would not work with the stock GB V5. I don't know why. All I know is I had to use Stock UK rom from samsung website with the back up made from the guide and EFS pro
Hope that helps some of you. Or someone can put it somewhere that it can be helpful. Use my instructions as you see fit.
Cheers
Click to expand...
Click to collapse
my friend: look on google store (google play) there is one AMAZING APP:
SGIIrepair
it will repair your EFS, then backup EFS
Good luck i hope this helps you as well!
SGIIrepair???
tigrisimo said:
my friend: look on google store (google play) there is one AMAZING APP:
SGIIrepair
it will repair your EFS, then backup EFS
Good luck i hope this helps you as well!
Click to expand...
Click to collapse
Sorry to come back but I found nothing like SGIIrepair in google shop
Bracher said:
Sorry to come back but I found nothing like SGIIrepair in google shop
Click to expand...
Click to collapse
Type in SiiRepair in google play should be top of the list by helioz
it worked for me when i had a blank imie...really easy.... then used his GalaxySUnlock and same it worked first time.
Only thing i did and would not reccomend is the kies or phone software update because this broke the imei again and now i cant get it back ?? the repair dont work anymore,
First thing is back up your EFS folder onto your ext sd card good luck

Bricked S6 please help

Hi guys
recently bought a s6 from ebay which was frozen on S6 logo. Basically managed to clear cache and factory reset from recovery but that didn't work, anyway I DL the O2 firmware and odin and put it into download mode I get a fail on odin when trying to install the rom
The phone has knox 1 and also has red writing SW Rev. Check Fail. Device: 3 Binary: 1.
I'm unsure what to do and if theres any chance for me to recover.
Many thanks
Mav
it failed because you flashed an incompatible Firmware.
where did it stopped flashing in odin? In sboot.bin?
If thats the case, you need to download proper firmware/country for your device.
Let me know what country is ur fone made of.
Hi thanks for your reply.
I managed to get it working by installing root and unikernel, it boots into O2 the firmwarw is 5.1.1
Only problem now is imei is 3500000000006
And it wont make calls dont know if imei is corrupt ir they sold me a stolen or lost phone?
I may install tw recovery and custom rom and see if that works.
Any suggestions?
Hi
Ive managed to sort out and get it to work infact typing on it now. Its currently rooted custom rom and twrp. I e managed also to restore original imei number so overall im quite pleased with myslef lol.
Anyway one last problem i have is ive tried all sims but none work i know ita picking up signal as the bar shows top right. Also chexk my settings.
Ive tried automatically and manually going to register networks but it says unable to connect try again later. I know uts not my area as my wifes s6 works perfectly. Sim also def works. The phone also picks up when a new sim has been inserted so i dont think its sim slot.
Any ideas guys
OK new update if anyone can help I'd really appreciate.
Installed new vador rom Imei reverted back and serial number is all zeros
Is this something to do with baseband if so how can I fix read somewhere about ariza patch but that was s3 4 etc.
Thanks
Mav
1. Your EFS is corrupted. The IMEI you see is a generic one, phone will be useless for network provider only wifi will work.
2. The one thing that caused this is by flashing an old bootloader to your phone. Thats why youve encountered Check Fail error on Download mode.
Happened to me also but got it fixed in the end.
OK thanks for the info how do I fix? I do have my wife's s6 but that's not rooted and don't want to root can I restore the efs
Many thanks
Mav
Been searching for ages can anyone please point me in the right direction for a fast download of stock o2 5.1 rom? I believe I may need this one G920F_O2U_G920FXXU2BOGC_G920FTEF2BOG1.zip at the moment rapid gator is going to take 10 hours lol.
Thanks
BTW is anyone out there on the s6 forums hardly getting any help really want to try and sort this thanks
maverick7777 said:
Been searching for ages can anyone please point me in the right direction for a fast download of stock o2 5.1 rom? I believe I may need this one G920F_O2U_G920FXXU2BOGC_G920FTEF2BOG1.zip at the moment rapid gator is going to take 10 hours lol.
Thanks
BTW is anyone out there on the s6 forums hardly getting any help really want to try and sort this thanks
Click to expand...
Click to collapse
I think I know one thread that has a firmware downloader with ultra fast download speed you may try searching it.
I dont know if it will help, but you may be able to successfully flash the firmware but many of those who have problems were unable to boot the phone due to corrupted efs data.
Here's my way of fixing it (if you still have intact efs). http://forum.xda-developers.com/showpost.php?p=63693480&postcount=28
But if its already wiped, there's no way you can retrieve it unless bringing it to samsung or any repair shop.
Anyways, mine was fixed (IMEI) using Octopus box repair tool. Since I cant do anything to recover my generic imei.
batuzai04123 said:
I think I know one thread that has a firmware downloader with ultra fast download speed you may try searching it.
I dont know if it will help, but you may be able to successfully flash the firmware but many of those who have problems were unable to boot the phone due to corrupted efs data.
Here's my way of fixing it (if you still have intact efs). http://forum.xda-developers.com/showpost.php?p=63693480&postcount=28
But if its already wiped, there's no way you can retrieve it unless bringing it to samsung or any repair shop.
Anyways, mine was fixed (IMEI) using Octopus box repair tool. Since I cant do anything to recover my generic imei.
Click to expand...
Click to collapse
Thanks silly question but how do I know if my efs is ok or corrupted?
at the moment the phone works perfect it is rooted, twrp recovery and vador rom but it just wont connect to networks. I know its not stolen or lost.
maverick7777 said:
Been searching for ages can anyone please point me in the right direction for a fast download of stock o2 5.1 rom? I believe I may need this one G920F_O2U_G920FXXU2BOGC_G920FTEF2BOG1.zip at the moment rapid gator is going to take 10 hours lol.
Thanks
BTW is anyone out there on the s6 forums hardly getting any help really want to try and sort this thanks
Click to expand...
Click to collapse
As far as i know if your EFS partition is corrupt and you do not have a back up of the EFS partition to restore which you probably dont as you bought this as broken then sim capability is dead, im not sure of any other way to fix this unless you have the intact efs partition
Hi
How can I tell if the efs is corrupt it shows a baseband it now shows the correct ime I
It just won't connect to network it says try again.
I can post a screen print of efs folder on es Explorer if anyone knows what it should look like
Here are screen prints but I think I'm speaking to myself lol
Hi there i spent months on fixing issues like this (i now have a tool that takes care of all this) , best thing you can do is flash to a rom where the original imei came back do a backup of the efs, flash to a orginal rom ( latest rom) make sure its the right one for your device, connect to kies, install the rom again root and restore the efs failing that the imei is blocked use checkmend.com the uk version if your from the uk, message me if you need help
maverick7777 said:
Thanks silly question but how do I know if my efs is ok or corrupted?
at the moment the phone works perfect it is rooted, twrp recovery and vador rom but it just wont connect to networks. I know its not stolen or lost.
Click to expand...
Click to collapse
Your rom, recovery and kernel doesnt have to do with corrupted efs.
Only way is to bring it to repair service using box tools to re enter/validate your imei so that you can connect to your network provider. There is no other way around other than retrieving your efs and installing it or thru repair service.
You may now relax yourself at finding ways to connect, I assure it wont help trying to flash and flash and flash stuff to your phone.
---------- Post added at 08:46 AM ---------- Previous post was at 08:37 AM ----------
Uhm can you send sms or make calls? It seems you have a valid Imei
Ok ive tried all stock roms including o2 and a uk btu one but no luck they all do the same thing get frozen on Samsung logo then I flash unikernel and it boots.
When checking my efs folder I can see no modem file I'm now wondering could that be the fault? so I downloaded modem and BL for 5.02 and 5.11 both will not flash via odin I get a fail message and on device check fail device: 3 binary: 1 messgage in red?????.
So I'm a little lost, I was wondering if I managed to root my wifes s6 which is virtually new could I back up her efs folder then copy it into mine and just amend the imei to my original would that work? also is there a way of rooting my wifes phone without triggering knox?
Any other suggestions guys I really don't know what bootloader was on it to start with or rom is there any way for me to find this out?, also another weird thing when the o2 uk roms install they install german apps?
Thanks guys
Ive repaired EFS Partitions with scripts downloaded from links at xda.
For example i trashed my EFS partition on my note 3 so it caused hard reboots after android booted up and it couldnt be fixed with anything else than the EFS partition repair scripts.
Edit: friend repaired his Note 4 also.
Thanks but where can I find these scripts as I've looked everywhere and if I did find how do I go about doing it. At the moment when I try to flash modem and bootloader it fails.
EFS brick
maverick7777 said:
Thanks but where can I find these scripts as I've looked everywhere and if I did find how do I go about doing it. At the moment when I try to flash modem and bootloader it fails.
Click to expand...
Click to collapse
hi my friend,
i have exactly the same issue as u, i'm really hopeless, did you get any solution so far??????????????????????????
i hate being using my s6 as an ipad mini, holding two phones in my pockets
ketman5001 said:
hi my friend,
i have exactly the same issue as u, i'm really hopeless, did you get any solution so far??????????????????????????
i hate being using my s6 as an ipad mini, holding two phones in my pockets
Click to expand...
Click to collapse
Same with me also need help

[Q] IMEI or EFS erased

Dear S6 Edge users
I was trying to install a new ROM on my samsung galaxy edge s6 (SCV31 g925j). And i wiped everything in TWRP before installing it. it seems liek i have wiped EFS with IMEI too. :silly:
Now, i have another device, so i took a backup of EFS in twrp and tried to resore it. However, my IMEI is still null.
Flashing stock ROM did not help too.
Could anyone please let me know if i can restore EFS/IMEI somehow? Can i copy it from my other device that actually works?
Many thanks
Bump
Technically you can restore efs backup from another phone.
Would it work without any problems, that is another question, but I honestly doubt it.
You could (if out of warranty) take phone to a 3rd party repair shop for fixing IMEI with Z3x box, or similar device, but some other issues (network, SIM, as in my case) could arise, not necessery, but could happen.
brenner650 said:
Technically you can restore efs backup from another phone.
Would it work without any problems, that is another question, but I honestly doubt it.
You could (if out of warranty) take phone to a 3rd party repair shop for fixing IMEI with Z3x box, or similar device, but some other issues (network, SIM, as in my case) could arise, not necessery, but could happen.
Click to expand...
Click to collapse
Thanks for reply. I guess i will have to try as many repair methods as possible (using root) and see if it helps.
If you manage to fix it without a box, please keep us posted, me and I belive lots of others would like to rebuild/repair efs.
Myself included
umka83 said:
Thanks for reply. I guess i will have to try as many repair methods as possible (using root) and see if it helps.
Click to expand...
Click to collapse
Did you manage to fix it somehow?
Unfortunately, i was unable to fix this. Restoring EFS from another device did not help

Efs file for galaxy j700h/m/f

Hey guys, does anyone of you have a backup of the Efs file for my Galaxy J700H? Coz, some people said that the only way that i'm gonna fix my phone is in that efs file.. But then dumbness happened that i Actually ERASED that File on TWRP
???. So now i'm suffering with no Sim Cards inserted on my phone and bringing two phone everywhere just to have contact to everybody. Soo guuuuys please heeelp me. Feel free to advice me on hos to fix my phone another way (if there is).. lol thanks in advanced! Have a good one!
yeah bro i have 3 efs for three imei and network..its working flash it with z3x 29.5
hi bro ihave 3 efs with three imei its working good ..
flash it in pda with odin...:victory::victory::victory:
this is my fb ------chico lass-----

Note 5 from hell! Nothing brings back the signal / IMEI / Baseband

i tried to unlock the note 5 i have using nv_data.bin without making a backup of my efs. got all the way through installing twrp, custom darkstar rom, and more. When i went to finally put a working sim card in it.... NO SIGNAL/BASEBAND UNKNOWN/IMEI UNKNOWN! i tried everything, from using smart switch, to odin.... Whole firmware flashing, to just modem.bin & sboot.bin (and others individually) for a while seperately it wouldn't work with a full firmware restore (using odin or z3x it would stop at cm.bin) but eventually i got it flashed and back to stock with odin & z3x on N920TUVU4DPK6 latest firmware, even used smart switch to flash to stock, but NOTHING brings back the imei or baseband. even tried to use xposed to change imei with app when it was showing up missing. efs backup pro didnt work as it couldnt read pit for some reason but odin could read pit just fine. z3x wont reset efs, wont repair, wont repair certificate, wont unlock. even the efs backup pro apk wont fix the problem.
Im all out of options... i am very knowledgeable about technology in general, and i have been rooting/flashing/tinkering with android phones for 4-5 years now (working with computers and tech for 15 years). Im stumped on this one... anyone who has some extensive knowledge in this department willing to connect with a team viewer session and try to help me out or at least post somethings to try.
I really need help BAD and am lost without guidance... i also can't afford to buy a new phone so im hoping this can work again soon. before i did anything it was working fine, only locked to t-mobile so i dont think its a hardware issue.
anyone out there got a heart (and brain lol) to help! :crying:
tailsmedia said:
i tried to unlock the note 5 i have using nv_data.bin without making a backup of my efs. got all the way through installing twrp, custom darkstar rom, and more. When i went to finally put a working sim card in it.... NO SIGNAL/BASEBAND UNKNOWN/IMEI UNKNOWN! i tried everything, from using smart switch, to odin.... Whole firmware flashing, to just modem.bin & sboot.bin (and others individually) for a while seperately it wouldn't work with a full firmware restore (using odin or z3x it would stop at cm.bin) but eventually i got it flashed and back to stock with odin & z3x on N920TUVU4DPK6 latest firmware, even used smart switch to flash to stock, but NOTHING brings back the imei or baseband. even tried to use xposed to change imei with app when it was showing up missing. efs backup pro didnt work as it couldnt read pit for some reason but odin could read pit just fine. z3x wont reset efs, wont repair, wont repair certificate, wont unlock. even the efs backup pro apk wont fix the problem.
Im all out of options... i am very knowledgeable about technology in general, and i have been rooting/flashing/tinkering with android phones for 4-5 years now (working with computers and tech for 15 years). Im stumped on this one... anyone who has some extensive knowledge in this department willing to connect with a team viewer session and try to help me out or at least post somethings to try.
I really need help BAD and am lost without guidance... i also can't afford to buy a new phone so im hoping this can work again soon. before i did anything it was working fine, only locked to t-mobile so i dont think its a hardware issue.
anyone out there got a heart (and brain lol) to help! :crying:
Click to expand...
Click to collapse
Do you have efs backup ? If you have made efs backup i can help you. If you don't have efs backup then i suggest you go to any repair center cuz odin or custom recovery not gonna do the job.
To restore efs/imei you will require a dongle box to write new cert files in efs partition.
Trex888 said:
Do you have efs backup ? If you have made efs backup i can help you. If you don't have efs backup then i suggest you go to any repair center cuz odin or custom recovery not gonna do the job.
To restore efs/imei you will require a dongle box to write new cert files in efs partition.
Click to expand...
Click to collapse
i have z3x and have been trying to re-werite a cert i found online but it didnt seem to do the job, and i dont have a backup, the backup i do have was after it stopped working :/
Kies or Samsung switch
Have you tried using the restore on either Kies or Samsung
Hey happened to me with the note 4. There is a guy on ebay I used and he repaired/restored imei remotely. Cost was 60 or 70 bucks. Took all of 10 mins. And phone was even unlocked afterwards. Might be with a shot.
tailsmedia said:
i tried to unlock the note 5 i have using nv_data.bin without making a backup of my efs. got all the way through installing twrp, custom darkstar rom, and more. When i went to finally put a working sim card in it.... NO SIGNAL/BASEBAND UNKNOWN/IMEI UNKNOWN! i tried everything, from using smart switch, to odin.... Whole firmware flashing, to just modem.bin & sboot.bin (and others individually) for a while seperately it wouldn't work with a full firmware restore (using odin or z3x it would stop at cm.bin) but eventually i got it flashed and back to stock with odin & z3x on N920TUVU4DPK6 latest firmware, even used smart switch to flash to stock, but NOTHING brings back the imei or baseband. even tried to use xposed to change imei with app when it was showing up missing. efs backup pro didnt work as it couldnt read pit for some reason but odin could read pit just fine. z3x wont reset efs, wont repair, wont repair certificate, wont unlock. even the efs backup pro apk wont fix the problem.
Im all out of options... i am very knowledgeable about technology in general, and i have been rooting/flashing/tinkering with android phones for 4-5 years now (working with computers and tech for 15 years). Im stumped on this one... anyone who has some extensive knowledge in this department willing to connect with a team viewer session and try to help me out or at least post somethings to try.
I really need help BAD and am lost without guidance... i also can't afford to buy a new phone so im hoping this can work again soon. before i did anything it was working fine, only locked to t-mobile so i dont think its a hardware issue.
anyone out there got a heart (and brain lol) to help! :crying:
Click to expand...
Click to collapse
I have the EXACT SAME problem that you have. I'm on the latest firmware N920TTMB4DPH2, I can't rollback to prior firmware. z3x couldn't detect my phone's modem, I've been looking for a solution too. In my case, someone told me (even z3x log said the same thing) that I have to downgrade the phone's modem, but I still couldn't find a way to do this. I think in my case, I have to wait for Samsung tool Pro to finally support the modem or find a way to downgrade the modem. (Can't even find any modem out there). I just tried Samsung tool Pro 27.4 today, still doesn't work. I think you might have seen this post? This might help?
http://forum.gsmhosting.com/vbb/f922/n920t-ph2-imei-repair-success-2132347/
Rjizzle1 said:
Have you tried using the restore on either Kies or Samsung
Click to expand...
Click to collapse
restored with smart switch and although the phone was back at stock, still baseband and imei was null / no service...
tomcklam said:
I have the EXACT SAME problem that you have. I'm on the latest firmware N920TTMB4DPH2, I can't rollback to prior firmware. z3x couldn't detect my phone's modem, I've been looking for a solution too. In my case, someone told me (even z3x log said the same thing) that I have to downgrade the phone's modem, but I still couldn't find a way to do this. I think in my case, I have to wait for Samsung tool Pro to finally support the modem or find a way to downgrade the modem. (Can't even find any modem out there). I just tried Samsung tool Pro 27.4 today, still doesn't work. I think you might have seen this post? This might help?
http://forum.gsmhosting.com/vbb/f922/n920t-ph2-imei-repair-success-2132347/
Click to expand...
Click to collapse
ive been flashing different modem.tar files with odin all to no luck, they take, and it says flash success (ok) but still null baseband
diopskill said:
Hey happened to me with the note 4. There is a guy on ebay I used and he repaired/restored imei remotely. Cost was 60 or 70 bucks. Took all of 10 mins. And phone was even unlocked afterwards. Might be with a shot.
Click to expand...
Click to collapse
u remember what he did? cause i dont have 60-70 $$$$ that was the reason i reached out here, hopefully someone could help or link me a guide i could follow... money is scarce around here :/
Removed
:crying:
tailsmedia said:
i tried to unlock the note 5 i have using nv_data.bin without making a backup of my efs. got all the way through installing twrp, custom darkstar rom, and more. When i went to finally put a working sim card in it.... NO SIGNAL/BASEBAND UNKNOWN/IMEI UNKNOWN! i tried everything, from using smart switch, to odin.... Whole firmware flashing, to just modem.bin & sboot.bin (and others individually) for a while seperately it wouldn't work with a full firmware restore (using odin or z3x it would stop at cm.bin) but eventually i got it flashed and back to stock with odin & z3x on N920TUVU4DPK6 latest firmware, even used smart switch to flash to stock, but NOTHING brings back the imei or baseband. even tried to use xposed to change imei with app when it was showing up missing. efs backup pro didnt work as it couldnt read pit for some reason but odin could read pit just fine. z3x wont reset efs, wont repair, wont repair certificate, wont unlock. even the efs backup pro apk wont fix the problem.
Im all out of options... i am very knowledgeable about technology in general, and i have been rooting/flashing/tinkering with android phones for 4-5 years now (working with computers and tech for 15 years). Im stumped on this one... anyone who has some extensive knowledge in this department willing to connect with a team viewer session and try to help me out or at least post somethings to try.
I really need help BAD and am lost without guidance... i also can't afford to buy a new phone so im hoping this can work again soon. before i did anything it was working fine, only locked to t-mobile so i dont think its a hardware issue.
anyone out there got a heart (and brain lol) to help! :crying:
Click to expand...
Click to collapse
Do you still have the nv data bin file?
tailsmedia said:
i tried to unlock the note 5 i have using nv_data.bin without making a backup of my efs. got all the way through installing twrp, custom darkstar rom, and more. When i went to finally put a working sim card in it.... NO SIGNAL/BASEBAND UNKNOWN/IMEI UNKNOWN! i tried everything, from using smart switch, to odin.... Whole firmware flashing, to just modem.bin & sboot.bin (and others individually) for a while seperately it wouldn't work with a full firmware restore (using odin or z3x it would stop at cm.bin) but eventually i got it flashed and back to stock with odin & z3x on N920TUVU4DPK6 latest firmware, even used smart switch to flash to stock, but NOTHING brings back the imei or baseband. even tried to use xposed to change imei with app when it was showing up missing. efs backup pro didnt work as it couldnt read pit for some reason but odin could read pit just fine. z3x wont reset efs, wont repair, wont repair certificate, wont unlock. even the efs backup pro apk wont fix the problem.
Im all out of options... i am very knowledgeable about technology in general, and i have been rooting/flashing/tinkering with android phones for 4-5 years now (working with computers and tech for 15 years). Im stumped on this one... anyone who has some extensive knowledge in this department willing to connect with a team viewer session and try to help me out or at least post somethings to try.
I really need help BAD and am lost without guidance... i also can't afford to buy a new phone so im hoping this can work again soon. before i did anything it was working fine, only locked to t-mobile so i dont think its a hardware issue.
anyone out there got a heart (and brain lol) to help! :crying:
Click to expand...
Click to collapse
what! add me on the list, i was searching the same problem, and i found this thread. i guess no one can help in this community with no backup efs file. my device is sm-n920t note 5. i can downgrade to lollipop by, from stock nougat i will root and flash custom firmware, then on the custom firmware i flash it to any stock rom. this doesn't solve the problem.
Haha same issue here... A year later... And still no solutions... Mine is SM-N920P. I accidentally rebuilt the nv_data.bin file and my unlocked phone is showing me that my SIM card is invalid. I'm busting my nuts to find a solution.

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