Database Users

Need EFS/IMEI help - I have backup but still not working

The Story
Don't even know where to start. Okay so I have a SM-935W8 (Canadian Version) and it was working perfectly fine running Project Dream rom the S8 one. I decided to flash angelo's Pixel rom for S7 Edge and for some reason when it booted, the network had a cancel sign meaning no network. Once I finished the initial setup, calling, messaging , and data weren't working. Luckily I have a backup for EFS and RADIO in tar, img. and tar.gz formats. So I downloaded the Partitions Backup app and restored the EFS and Radio files, it said successfully restored. I rebooted my device and the issue was still there, no network. So then I installed the stock ROGERS (Provider) rom from SAM MOBILE and it came up with some DRK error and my phone would not boot. So then I quickly used ODIN to flash twrp and then flash Superman Rom (Love it) and use dm-verity bypass.zip to get past the drk error. Then I attempted many other things but to no avail such as flashing the EFS tar through ODIN which caused a "Software Error" and phone to be stuck on a light blue software error screen so I had to use smart switch to FULLY restore the phone back to booting up, then once again I flashed twrp and Superman rom with dm-verity so I atleast have root and a decent rom to work from.
The Problem and What I Have at Disposal
So essentially, I currently have a new section in settings under Connections called "SIM card manager" for managing sim cards even tho I only have 1 slot, it shows that the SIM is ROGERS and LTE/3G/2G in there, but it can't connect to a network and keeps saying Not Registered on a Network. Also, there are 2 IMEI's since my phone thinks theres 2 SIM slots but I really only have 1 slot. BUT HERE IS THE MAIN ISSUE, THE ROOT OF ALL PROBLEMS, the IMEI is reading as "000000000000000" and the IMEISV is "01". Hence im getting Not Registered on a Network. No secret codes such as *#06# are working, keeps giving the Not Registered on a Network error.
I have the EFS and RADIO backups in img, tar, and tar.gz formats as well as screenshots of all my MAC and Bluetooth addresses, IMEI and Serial #'s and all that information. So essentially I feel fully ready to solve the problem but everything I try keeps failing. My EFS restoration says successful in the APP but upon reboot, theres no change. Flashing the EFS through ODIN messes up phone harder. When I use EFS Professional Tool, where do I place the partitions so they show up in the tool?
I used this post to try to fix it: https://forum.xda-developers.com/s7-edge/how-to/guide-how-to-fix-check-drk-imei-issues-t3379516
BUT when I'm flashing the combination through ODIN in AP, it goes to NAND write or whatever and gets stuck, sometimes it gets stuck on Analyzing files or something. I tried every single ODIN version. I really could use some expertise on this issue. A step by step written tutorial, some method anything!!!! Help on this post or even teamviewer or skype for live help would be appreciated. Please help and I'm willing to compensate for successfully helping me fix my issue..

Did you ever sort this out? I'm in a similar situation, except that it does occasionally show my IMEI but also 'baseband unknown'. But still no network access.

i hope i dont risk a warning, but you can use xposed and with root you can change your imei and baseband info.

012345678 said:
i hope i dont risk a warning, but you can use xposed and with root you can change your imei and baseband info.
Click to expand...
Click to collapse
Thanks, I've done so much to this phone now...
I did try xposed and have tried a different IMEI, it seems like it's a modem issue but there doesn't seem to be a firmware solution - I have tried so many stock roms(All the way back to the first Marshmallow and a bunch in between) and different custom roms too but in the end the error is always there: Not registered to Network.
I saw somewhere in my troubleshooting that some kind of cert needs to be patched because the phone did an update on a modified rom without the OEM unlock being on and then the EFS data was messed up or something like that (all of the research and troubleshooting is starting to blur). It seems like that fix isn't doable without a rather expensive piece of hardware (expensive if your just fixing your one phone I guess) and there isn't any firmware-only fix that can accomplish this patch so I'm stuck again.

jamesroodney said:
Thanks, I've done so much to this phone now...
I did try xposed and have tried a different IMEI, it seems like it's a modem issue but there doesn't seem to be a firmware solution - I have tried so many stock roms(All the way back to the first Marshmallow and a bunch in between) and different custom roms too but in the end the error is always there: Not registered to Network.
I saw somewhere in my troubleshooting that some kind of cert needs to be patched because the phone did an update on a modified rom without the OEM unlock being on and then the EFS data was messed up or something like that (all of the research and troubleshooting is starting to blur). It seems like that fix isn't doable without a rather expensive piece of hardware (expensive if your just fixing your one phone I guess) and there isn't any firmware-only fix that can accomplish this patch so I'm stuck again.
Click to expand...
Click to collapse
i think i can help you out with that. install that with odin, it should get your efs and imei back:
Samsung S7 Edge Cert and Efs (SM-G935F)
https://drive.google.com/file/d/0B5829G4TER3CZmZYVU9PY21qT2c

012345678 said:
i think i can help you out with that. install that with odin, it should get your efs and imei back:
Samsung S7 Edge Cert and Efs (SM-G935F)
https://drive.google.com/file/d/0B5829G4TER3CZmZYVU9PY21qT2c
Click to expand...
Click to collapse
Sorry, I should have clarified. I have an S7 (SM-G930W8). I only tried this thread because the issue was identical to mine and I couldn't find anything similar referencing the S7 specifically.

For anyone coming across this thread in the future, although mine was an S7 I think the issue would apply to both. I ended up ordering a z3x in order to use the patch certificate. But it wasn't that easy; the firmware had to be downgraded to marshmallow first which wouldn't work in Odin until I tried just flashing the BL and CP files first, then rebooting and flashing the AP and CSC files separately. In fact, the AP file froze the first time but passed on the second attempt. After that, everything was downgraded to android 6 and then the patch certificate option worked and my s7 connects to the network again.

I'm having a similar problem with my sm-g935w8 Rodgers but has been unlocked. A couple days ago i looked at my phone and it was showing a no signal symbol and I look for my phones information and it showed unknown in all categories, the imei say unknown, and it's not reading the sim. Help me

I am having the same problem after installing TGP ROM.

Graschuk said:
I am having the same problem after installing TGP ROM.
Click to expand...
Click to collapse
Did u Found any solution? am still in the same position as u r in.. i have also installed TGP ROM ... I Have Also Posted there my issue that i selected the latest bootloader nd modem blah blah

Wipe everything in twrp advanced and..
Flash latest stock rom for your model and it'll fix the issue

I think u need to see this
https://forum.xda-developers.com/showthread.php?p=78868375#post78868375

These two threads are the fountains of info :
https://forum.xda-developers.com/s7-edge/how-to/guide-how-to-fix-check-drk-imei-issues-t3379516
This one specifically for S7 edge, whole lots of info.
https://forum.xda-developers.com/note-4/general/fix-drk-dm-verity-factory-csc-serial-t3422965
This one for advanced users who know what they are doing.. it isn't specifically for s7 series but has a universal approach to understand concepts.. don't use the provided drk (prov data) and csc restoring files, they aren't for s7 edge.
Always backup efs and all radio/serial related info firstly after rooting. Good luck
Sent from my S7 Edge using XDA Labs

Note 4 N910C Emergency Call only (Not Registered to Network) IMEICERT:PASS (IMEI Ok )

Greetings Folks
I have a N910C and as mentioned in title recently I got stuck in to this issue
How it happened
I had CF-Rooted my phone and Odin flashed TWRP for custom ROMS so I tried a few and was not getting the perfomance thought SimplROM would do it for me in order to install that ROM it said in instructions to install latest Modem and Bootloader
So i tried downloading the ones given in v6C BL was downloaded but CP kept on giving me errors getting stuck at 7% on mega so being stupid I downloaded DPCB(MODEM) While ROM was offering DPK4
So everything went fine until after boot I realized am facing Not Registered to Network
Since I had experienced this before on other phone I went ASAP in dialer to check my IMEI & SN both are still intact
I knew about EFS unfortunately I backed it up on Phone Storage which was wiped for ROM and I forgot (So dont have EFS Backup )
I do recall years ago back when I had S3 I experienced this and sometimes flashing different firmware(CSC ,Modem) fixed it
What I have tried so far
I have already tried several stock ROMs most of em had DPI1 Baseband except 2 other ROMS no luck
tried combination file method too (the one that helps downgrade to kitkat i believe ) no luck
Tried XEO repair Firmware no luck
any suggestions ??
and on that contrary now that I am not on stock is there any way to find out which CSC and Stock ROM this phone originally was one or came with with IMEI or Serial I believe ?
Thanks in Advance

Anyone??

under the battery there's the serial number
install on your pc samsung smart switch program
run it with option of emergency software recovery - device initialisation
input the model of your phone
input the serial number
start
have patience and a good connection
your phone will (eventually) get the latest official firmware
https://www.blogtechtips.com/2017/06/24/easily-restore-samsung-device-firmware-with-smart-switch/
at least you'll have a working phone with stock rom
from here on you can try again and get informed better on what to do
good luck

w41ru5 said:
under the battery there's the serial number
install on your pc samsung smart switch program
run it with option of emergency software recovery - device initialisation
input the model of your phone
input the serial number
start
have patience and a good connection
your phone will (eventually) get the latest official firmware
https://www.blogtechtips.com/2017/06/24/easily-restore-samsung-device-firmware-with-smart-switch/
at least you'll have a working phone with stock rom
from here on you can try again and get informed better on what to do
good luck
Click to expand...
Click to collapse
Hey there bud I have almost tried most of fixes I could I'll give Smart Switch a try as I recall I checked before it didn't have initialization just the recovery mode, while in Kies 3 I did try initialization method by model and SN but it prompted device doesn't support initialization
Anyways do you think it could fix network?
Sent from my Pixel 2 XL using Tapatalk

crossmedia said:
Hey there bud I have almost tried most of fixes I could I'll give Smart Switch a try as I recall I checked before it didn't have initialization just the recovery mode, while in Kies 3 I did try initialization method by model and SN but it prompted device doesn't support initialization
Anyways do you think it could fix network?
Click to expand...
Click to collapse
Maybe restore the efs from recovery, if you have a backup that was working.

w41ru5 said:
Maybe restore the efs from recovery, if you have a backup that was working.
Click to expand...
Click to collapse
Jist checked not getting initialization option on smart switch ill see a work around it if its a version thing , as for working backup I lost it mate it was in twrp folder in phone storage it got wiped recovery softwares out there only help recovering media mostly if mass storage mount was option could have tried recovering for PC but that has been long gone since ICS
Sent from my Pixel 2 XL using Tapatalk

Yep. Same problem as mine. Im kinda lost now since i dont have anything; even in stock rom it cannot go beyond connecting to my carrier. It only able to read my contact.
Im guessing its a motherboard problem? Isnt it @w41ru5?

VannM said:
Yep. Same problem as mine. Im kinda lost now since i dont have anything; even in stock rom it cannot go beyond connecting to my carrier. It only able to read my contact.
Im guessing its a motherboard problem? Isnt it @w41ru5?
Click to expand...
Click to collapse
I don't know. Usually it's a modem issue when not recognizing the sim.
If it's a 910F snapdragon it might be the infamous eMMC issue.
If you have an EFS backup try to restore it from recovery TWRP.

Assuming its modem problem, its related to motherboard i guess, right?
Finally got the phone working, only to discovered that SIM not working. Really wasting my time and hype!
Plus, its hard to search for n910c replacement board here.

VannM said:
Assuming its modem problem, its related to motherboard i guess, right?
Finally got the phone working, only to discovered that SIM not working. Really wasting my time and hype!
Plus, its hard to search for n910c replacement board here.
Click to expand...
Click to collapse
The firmware, not the physical one.
Did you try to flash the 4 files repair firmware?
This is an example, I don't know what phone you have
https://firmware.gem-flash.com/index.php?a=downloads&b=folder&id=7081
Did you try the SmartSwitch pc program?

"...4 file repair..."- what? Ive google it until im almost run out of data here and you have a possible solution? You must be active in note4 forum.
One thing i noticed that, the IMEI and Serial Number are different from the sticker included.
I will try it, but not immediately; waiting for thurday-friday for data renewal.
My phone is n910c
EDIT : just checked the page you gave. I have few question;
What should i do with the files? What are the step? What are the program needed?
Is it related to SmartSwitch as you mention; need to use it?
Thanks!

VannM said:
"...4 file repair..."- what? Ive google it until im almost run out of data here and you have a possible solution? You must be active in note4 forum.
One thing i noticed that, the IMEI and Serial Number are different from the sticker included.
I will try it, but not immediately; waiting for thurday-friday for data renewal.
My phone is n910c
EDIT : just checked the page you gave. I have few question;
What should i do with the files? What are the step? What are the program needed?
Is it related to SmartSwitch as you mention; need to use it?
Thanks!
Click to expand...
Click to collapse
1. It's good you still have the IMEI. Not so important if they're different from the sticker. Where did you buy the phone from?
2. So if you go to check the 4 files repair, you need to search on that site the files for a 910C.
3. Did the phone worked on your country provider? If yes, maybe you need to search for the 4files corresponding to your region code.
4. These 4files have to be flashed with Odin
https://zfirmware.com/download-samsung-repair-firmwares/
5. SmartSwitch is an alternative to get the latest firmware for your phone according with the model and serial number.
https://www.sammobile.com/forum/threads/29914-SmartSwitch-Install-amp-update-or-replace-firmware

the "firmware.gem" are useless. the error says i need another package (i assume a quota) to download the needed files.
im currently testing "zfirmware", but have a doubt since it only give 1 type file (which country is it i dunno). but yeah, since my phone like that, it wouldnt hurt to try
EDIT : yep, nothing changed. the device not even bricked.

VannM said:
the "firmware.gem" are useless. the error says i need another package (i assume a quota) to download the needed files.
im currently testing "zfirmware", but have a doubt since it only give 1 type file (which country is it i dunno). but yeah, since my phone like that, it wouldnt hurt to try
EDIT : yep, nothing changed. the device not even bricked.
Click to expand...
Click to collapse
If something does not work, why do you give up so easy?
http://www.mediafire.com/file/a2fdo0xm9nat5jt/N910CXXS2DPJ3_N910CZTO2DPE2_ZTO.zip - this is marshmallow
https://androidfilehost.com/?fid=24269982087001472 - this is for lolipop
Put the phone in download mode, open Odin and try.
And try the smartswitch also.

w41ru5 said:
If something does not work, why do you give up so easy?
Click to expand...
Click to collapse
That hurts. A lot. Explanation below.
w41ru5 said:
http://www.mediafire.com/file/a2fdo0xm9nat5jt/N910CXXS2DPJ3_N910CZTO2DPE2_ZTO.zip - this is marshmallow
https://androidfilehost.com/?fid=24269982087001472 - this is for lolipop
Put the phone in download mode, open Odin and try.
And try the smartswitch also.
Click to expand...
Click to collapse
I tried files from LP and MM. It didnt work. And also smartswitch.
I was hoping that it will brick the phone (if i ever missed a step or incorrect file) but it didnt.
Might as well try looking for replacement board (or even a refurbished note4).
Thanks though for the suggestion @w41ru5!

Greetings again folks reading your replies above I have been trying almost every fix there is out there
First of all about Emergency Calls Only/Not Registered on Network
It can be due to several causes its can be Hardware ie faulty modem
it can be bad network coverage
it can be bad simcard
it can be SW with EFS problems or maybe even on rare occasion a modem file that you flashed
EFS can be either bad IMEI with CERT : FAIL or Just Network with IMEI and SN intact
just dial *#0011*# and see if you have CERT : PASS ( also someone with good IMEI/CERT and working network can share screenshot so i can compare whats wrong)
I am certain mine is EFS related because it happened after flashing modem DPCB modem via ODIN (I had TWRP EFS backup but the blunder I made was backing it up on phone storage and being careless forgot it was there and was wiped for custom ROM flashing process)
So far what I have tried
Combination File Method (and even downgrade to KK 4.4.4 )
Repair Firmware that include AP,BL,CP,CSC and even PIT
Kies 3 or Older Smart Switch says (Device doesn't support initialization ) since initialization feature was removed by Samsung on newer Smartswitch(since it was being used for wrong reasons? read somewhere)
Several different firmware's
OTA update
My IMEI CERT says PASS if only we had a network patch like Ariza Patch (for Galaxy S3) for Note 4 then we would be in luck so far at this point I dont think flashing ROM's would even help with bad EFS our only luck is Box e.g Z3x or Octo dont know if we are allowed to talk about those here (ill edit post if not)
these box applications have Network Patch for most Samsung models but I don't see one for N910C in most versions
for those with bad IMEI they can try writing good cert or efs on note 4 since they have already lost it I am sitting on it because my EFS is good on that part and for some reason box app isnt allowing me to back up my CERT if I am able to back up current cert then ill give those a try but I would prefer current IMEI since in my country IMEI should be verified to use the phone or you have to pay tax
I know its Bad EFS for sure because using Box application I chose reset EFS(after backing up current faulty EFS with good IMEI) upon reboot phone's imei was changed with no SN network came back for few seconds then gone again ,this happened to many users that have tried resetting EFS so I restored my original EFS
if anyone here with N910C and root can give me EFS folder I can corelate if any file required for network is missing since i have good IMEI
Cheers!

SM-J730G(M): No idea what I did to the OS

Hey! Newbie here in need of some help... (sorry for the poor formatting)
So about two years ago i got a J7 Pro (box says SM-J730G/DS, which is important for later) from my carrier (IUS) (MX), and I tried to root it. Apparently it didn't go well or something, I honestly have no recollection, and then because of external forces I had to change to iPhone.
The only thing I remeber before I stopped using it is that the settings app was kinda messed up (eg. there were two "Battery" settings, there was a new option called "Service provider" which had the options "KT twophone service", which apparently is Korean, and "My Wi-Fi home settings", etc.) Also, I got a "Processing failed" error message when wanting to check for updates.
Now yesterday I decided to unearth it again and of couse everything was the same, so I investigated how to return to stock firmware. The Smart Switch option isn't possible anymore; the only viable way (atm) for me is via Odin. The phone also somehow does not boot into recovery mode by Volume Down + Power.
I downloaded the firmware, and this is where everything gets messy. It seems the firmware I had flashed previously was SM-J730GM, which is still the only one I can find for my carrier and region. It is the firmware too that I flashed today (J730GMUBU2AQI3 and J730GMUBU2AQF3) through Odin, however I was not able to flash the BL, CP and CSC, because I would get a myriad of errors (one run I would get "repartition operation failed", on another, "cm.bin fail", or fail on the "set .pit file", and so on).
Remember when I said the box info was important? Yeah, the app Phone Info *Samsung* says both the bootloader and the broadband version are J730GUBU1AQF3, not J730GMUBU2AQF3. However, Sammobile says that for my region/carrier (MX/IUS), it is GM, not G. The back of my phone, however, says J730G/DS
I am at a loss. I read that one possibility is to use the Re-partition and NAND Erase options in Odin, but since I don't know whether my phone is J730G or J730GM, and I don't have a way to backup my EFS folder, I don't feel like doing that.
Could someone please explain to me what I can do to fix this?
Here is the settings screenshots link: https:// imgur . com/a/7k8jZcX
And of the Phone Info app: https:// imgur . com/a/YDDhaqd
Again, I'm really sorry for the formatting.

akathoristos said:
Hey! Newbie here in need of some help... (sorry for the poor formatting)
So about two years ago i got a J7 Pro (box says SM-J730G/DS, which is important for later) from my carrier (IUS) (MX), and I tried to root it. Apparently it didn't go well or something, I honestly have no recollection, and then because of external forces I had to change to iPhone.
The only thing I remeber before I stopped using it is that the settings app was kinda messed up (eg. there were two "Battery" settings, there was a new option called "Service provider" which had the options "KT twophone service", which apparently is Korean, and "My Wi-Fi home settings", etc.) Also, I got a "Processing failed" error message when wanting to check for updates.
Now yesterday I decided to unearth it again and of couse everything was the same, so I investigated how to return to stock firmware. The Smart Switch option isn't possible anymore; the only viable way (atm) for me is via Odin. The phone also somehow does not boot into recovery mode by Volume Down + Power.
I downloaded the firmware, and this is where everything gets messy. It seems the firmware I had flashed previously was SM-J730GM, which is still the only one I can find for my carrier and region. It is the firmware too that I flashed today (J730GMUBU2AQI3 and J730GMUBU2AQF3) through Odin, however I was not able to flash the BL, CP and CSC, because I would get a myriad of errors (one run I would get "repartition operation failed", on another, "cm.bin fail", or fail on the "set .pit file", and so on).
Remember when I said the box info was important? Yeah, the app Phone Info *Samsung* says both the bootloader and the broadband version are J730GUBU1AQF3, not J730GMUBU2AQF3. However, Sammobile says that for my region/carrier (MX/IUS), it is GM, not G. The back of my phone, however, says J730G/DS
I am at a loss. I read that one possibility is to use the Re-partition and NAND Erase options in Odin, but since I don't know whether my phone is J730G or J730GM, and I don't have a way to backup my EFS folder, I don't feel like doing that.
Could someone please explain to me what I can do to fix this?
Here is the settings screenshots link: https:// imgur . com/a/7k8jZcX
And of the Phone Info app: https:// imgur . com/a/YDDhaqd
Again, I'm really sorry for the formatting.
Click to expand...
Click to collapse
1. Try heimdall instead of odin
2. Try with pc, adb fastboot wipe commands

akathoristos said:
Hey! Newbie here in need of some help... (sorry for the poor formatting)
.....
Click to expand...
Click to collapse
Okay so,
1. What is the current state of your phone(is it bricked or working)?
2. What version of Android do you have( 7.0 Nougat ) or ?
If your phone is NOT bricked, I recommend first to go to developer settings and do OEM unlock
(you can enable developer settings by tapping the field Build Number fast multiple times in About phone information)
then, you can download stock firmware for J730G( not J730GM) and it doesn't have to be from your carrier or country.
After that, you can either use your stock rom or flash recovery and then flash custom ROM.

[SAMUSUNG GALAXY A41] - Imei Repair

Hello everyone,
I explain you my problem:
I tried this morning to update my samsung galaxy A41 SM-A415F rooted with Magisk (firmware patched via magisk) to the latest version (A415FXXU1CUH2) that can be seen on sammobile :
Download Samsung Galaxy A41 SM-A415F XEF France A415FXXU1CUH2 firmware​
So I tried to update the phone by setting the HOME_CSC to odin but what was the surprise when the phone rebooted? Some partitions were corrupted and I had no choice but to reset the phone.
I wanted to reset the phone with the last ROM and so I started the installation on odin BUT I checked the option "Nand Erase" and "Re-partition" and since then the IMEI number has been deleted and I can't put it back nor send messages / calls etc.
I have searched everywhere on the internet and even trying to put back the last ROM doesn't work and when I want to do *#06# the message: sm-a415f is not supported on showIMEI is displayed
After a while I found a tutorial on the internet that said I had to put the .pit file of my rom in the "PIT" tab on Odin in addition to my ROM because I had deleted all the partitions of the phone... I checked the Re-Partition option in addition to F. Reset Time & Auto Reboot to register the .pit but it didn't work, I always get 2 errors: One when I reset the phone before the menu with all the apps is displayed telling me: "IMEI or MEID is empty" and another one when I try to see the IMEI number when I press *#06# in the phone app telling me: sm-a415f is not supported on showIMEI
I thank you in advance for your help,
Sincerely.
Edit:
Oh yeah, and the phone doesn't detect the sim card even when I take it out and put it back in...

Hello,
i also have a similar problem.
I rooted the samsung A41 smartphone with magisk. After a while, I wanted to go back and put the original firmware back. Everything worked until I installed update A415FXXU1CUH2. Now the IMEI is empty and the sim card cannot be used. I went back to the A415FXXU1CUD4 version and now everything works fine. I initially blamed all these problems whit the root, but looking around on web I saw that the IMEI problem happens.
Can't read SIM cards after the latest update
Hello, I received and installed a firmware update two days ago. I noticed cell signal icon was replaced by a crossed circle; . Also, the options for 4G and 5G are nonresponsive, the menu options are not greyed out but they are unresponsive when pressed. So I can't connect to my cell service...
eu.community.samsung.com
Samsung A21s software update problem
After the last update.. I have lost my connection to 3g/4g ... my phone only connects to my home wifi... but doesn't connect anywhere else. Any advice?
eu.community.samsung.com

Problem: IMEI is null after updating to A415FXXU1CUH2. Cant call, message or use data.
Solution: Flash earlier firmware or restore from your full backup.
I confirm this IMEI problem and that the @Arazon´s solution works.
I tried to update the phone to the latest stock firmware Android 11 (A415FXXU1CUH2) from an earlier version. I got everything to work except the IMEI showed null. I tried flashing with both root and non-root. I tough I had broken the EFS-partition but luckily that was not the case. Somehow the IMEI could not be red with the newest firmware. I guess Samsung needs to fix it and we have to wait for a few months? Anyways I will try updating the A41 "the normal way" and then flashing my root after that. Maybe it will work.
I wonder when we get the unofficial LineageOS for the A41 SM-A415F. Hit me up if you are up to it, I might be able to help.

Judxx said:
Problem: IMEI is null after updating to A415FXXU1CUH2. Cant call, message or use data.
Solution: Flash earlier firmware or restore from your full backup.
I confirm this IMEI problem and that the @Arazon´s solution works.
I tried to update the phone to the latest stock firmware Android 11 (A415FXXU1CUH2) from an earlier version. I got everything to work except the IMEI showed null. I tried flashing with both root and non-root. I tough I had broken the EFS-partition but luckily that was not the case. Somehow the IMEI could not be red with the newest firmware. I guess Samsung needs to fix it and we have to wait for a few months? Anyways I will try updating the A41 "the normal way" and then flashing my root after that. Maybe it will work.
I wonder when we get the unofficial LineageOS for the A41 SM-A415F. Hit me up if you are up to it, I might be able to help.
Click to expand...
Click to collapse
I tried updating the A41 with bootloader locked but the results were the same. It seems that if you have tripped the Knox (voided warranty) the recent update A415FXXU1CUH2 will somehow break your imei and it will show up as null.
These firmware versions (root or non-root) do work and the imei problem does not exist even with tripped knox and unlocked bootloader:
A415FXXS1CUG1
A415FXXU1CUD4
A415FXXU1BUC3 and older

Bootloader Versions in StockRoms and CombinationFiles or Google 2 Phase Authorization

I bought a A510F (A5 (2016)) from my company und unfortunately I had to FactoryReset it in recovery, because the telephone PIN was lost. What I was facing was the FRP login-screen (never seen before). No problem I thought, get the google account from my company (with which the phone was initially installed) and I can continue, and I got the password. But there seems to be 2-phase-authorization or google asks for a second authorization step regardless of 1-phase or 2-phase setting (I also can't login to it from my PC without 2. phase). A college of mine also told me (he has one of the 33(!) devices, which are registered at this google account and got a message about my login attempt), that there was no "Yes" button at this message (as described on my locked phone), and the message disapeared very fast. (Can anyone tell me, how this 2-phase-authorization really works? Or is there another way for the second phase of authorization then annoying all my 33 colleges with login attempts?).
The second thing I thougt about, is to flash a combination file to get rid of this frp. But I'm not shure if I found the right one. The version of the stockRom is A510FXXS8CSC2. I know, that the version of bootloader is important. The combination file has the name A510FXXU8ASE1. Now, some people in this forum say "8" is the version of bootloader, other say S8 / U8 are the versions. So if only the digit is the version, I can use the combination file, if it is the mix of one letter and one digit, it doesnt match. I couldn't find a combination file with "S" in the name, all have an "U". Can someone tell me the meaning of this letter. And would this combination file work with my A510FXXS8CSC2 StockRom?
And last not least: will I be able to flash the combination file without having OEM-Unlock on (and FRP off)?
Thanks for reading and thanks for answers ahead.
I forgot: I have tried some other guidances to bypass FRP but none of them work anymore (or are too risky in my eyes). I think the StockRom has a lot of holes fixed meanwhile. Its one of the newest of the German Telekom.

What I forgot to ask. What will happen to the FRP security check after reboot, when I manage to remove the device from the devices list of the Google account? (Maybe from PC login to Googles account settings, look for registered device, find the right one from the 33 (how?) and remove it. I think, I saw such a hint that it could work. And how will be the reaction of the phone? Will it ask to Google, answer would be device is not registered and it lets me continue phone initialisation without FRP security login? Or will the device will be locked forever, because FRP flag is on and there is no account, where it is registered anymore ?

So finally I got it. I tried to flash the A510FXXU8ASE1 Combination file over the installed StockROM A510FXXS8CSC2 and it booted fine. I only switched on the developer options and checked for USB-Debugging on (which already was) and in IME-Preferences (icon like a calculator) I checked for the USB mode with *#0808# . I left ADB+MTP on (which already was). And rebooted to Download-Mode. First and second try gave me an error message (Exception in Bootloader), I booted into Combination Firmware again and made the device shutdown with powerbutton (not reboot) (and I also disconnected USB cable). Then the boot in Download Mode worked.
Now the next problem. I could not reinstall the StockRom A510FXXS8CSC2 (from Sammobile), odin failed after flashing hidden.img. (Maybe someone could explain, whats the reason, StockRoms Bootloader to old? Pit modified by Combination file so that a partition dosn't fits the StockRom? I dont know...)
But the source, where I downloaded den CombinationFile also provided a StockRom (DmRepairTech) and I was able to flash this StockROM. (it started in turkish, so a translater was my friend, look for "gil" in settings, this means language)
I only enabled OEM-Unlock (which disables FRP lock, as far as I know) and then I flashed TRWP-Recovery and LineageOS (which is an android 10 insted of StockRoms android 7 ). Now I'm satified and ready to use the phone.
One question isn't anwered yet: why cant I reinstall original StockRom after CombinationFile...?
May someone will help this approach. Its not based on facts, only trial and error.