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S8+ G955FXXU2CRED with Bootloader V2 - options for flashing, downgrade, FRP Unlock?

Short question: how can I downgrade or FRP unlock a S8+ G955F that is FRP locked and on very recent firmware?
Here are the details:
I am trying to assist a family member with a Galaxy S8+ (SM-G955F) that they have just purchased online. When purchasing it they were not told that FRP lock is on (FRP LOCK: ON) and OEM lock is on (OEM LOCK: ON). It was running Bootloader v2 on very recent stock firmware. It has been successfully flashed with BL_G955FXXU2CRED and AP_G955FXXU2CRED...
It was on G955FXXU2CRED firmware. I was able to successfully able to flash the Combination ROM COMBINATION_FA70_G955FXXU2ARE1 (full name COMBINATION_FA70_G955FXXU2ARE1_CL12792727_QB18097821_REV00_user_mid_noship.tar)
With combination rom, it seemed that I could enable USB Debugging, and also follow the steps for *#0808# IME to enable the appropriate mode for adb codes to be entered. I was able to find the device with 'adb devices', and I thought that the FRP unlock codes on the command line worked. But after re-flashing to the current Stock Firmware again, FRP lock was still there.
It seems I need to downgrade to Nougat 7.0, but I am on Bootloader V2. Odin identifies it by a FAIL with binary not matched (2 vs 1). So it seems that if I could get a method to keep Bootloader V2 and install Stock Firmware for Android 7.0 Nougat, I would be halfway there to fixing the FRP problem. However, I can't find any firmware or ROMs for G955F that includes Bootloader V2. This is identified by a U2 in the firmware name, like: G955FXXU2CRED . Is there a way to keep the BL Bootloader V2 but install AP ROM from Nougat?
I have spent many hours on this so far, and I just wanted to say thank you to all you guys who are helping on XDA, I really appreciate it. I have read about 7 day waiting periods for OEM UNLOCK but I don't see how it applies, as I can't do anything aside from use Combination ROM, use Odin, or go to the FRP locked FW which seems to be a dead end?
If there was a reliable method for rooting this G955F device with this G955FXXU2CRED firmware, I would be open to trying it.

details
Another note: AP SW Rev is identified as B:2 K:1 S:1

I don't think once a phone has the boot loader CRED, that the phone can be downgraded. Hope I am wrong.

JeffDC said:
I don't think once a phone has the boot loader CRED, that the phone can be downgraded. Hope I am wrong.
Click to expand...
Click to collapse
I think you are right. The combination ROM seems to built on selinux version 7.
I think I need to root with twrp. But first I need to enable OEM unlock. I'm not sure if that will be possible with combination ROM or if I should flash latest stock and then wait 7 days??

same problem here... If an solution available pls write here

anonan said:
I think you are right. The combination ROM seems to built on selinux version 7.
I think I need to root with twrp. But first I need to enable OEM unlock. I'm not sure if that will be possible with combination ROM or if I should flash latest stock and then wait 7 days??
Click to expand...
Click to collapse
Flashing stock rom and waiting 7 days would be the safe option.
I am not exactly sure what you are trying to achieve.
https://www.samsung.com/us/support/frp/

anonan said:
I think you are right. The combination ROM seems to built on selinux version 7.
I think I need to root with twrp. But first I need to enable OEM unlock. I'm not sure if that will be possible with combination ROM or if I should flash latest stock and then wait 7 days??
Click to expand...
Click to collapse
I think I read someone on CarHDRom who flashed the rom via TWRP, and then when the phone booted into system for the first time at setting up, they changed the date to 8 days earlier, and when the phone setup was completed and booted into system, the OEM unlock was available.
Re: CRED I believe once it has been installed on a phone, you can not go back to a previous version (pre CRED).

JeffDC said:
I think I read someone on CarHDRom who flashed the rom via TWRP, and then when the phone booted into system for the first time at setting up, they changed the date to 8 days earlier,.
Click to expand...
Click to collapse
I wonder if I can do this date trick with combination FW to enable OEM unlock.

anonan said:
I wonder if I can do this date trick with combination FW to enable OEM unlock.
Click to expand...
Click to collapse
It seems there are a few solutions to frp if you can selectively restore flash files. It looks like Samsung tool Pro can do this, but is there any free adb method?
http://forum.gsmhosting.com/vbb/f453/new-solution-remove-frp-s8-plus-sm-g955f-last-security-2422242/
Especially this http://forum.gsmhosting.com/vbb/f453/g955f-rev-2-frp-100-no-box-2417931/

Hi, could you send me a link of the combination firmware please Can't find it anywhere My email address is [email protected] I currently have similar experience of yours I thought everythings gonna be okay but it was too good to be true Help
anonan said:
Short question: how can I downgrade or FRP unlock a S8+ G955F that is FRP locked and on very recent firmware?
Here are the details:
I am trying to assist a family member with a Galaxy S8+ (SM-G955F) that they have just purchased online. When purchasing it they were not told that FRP lock is on (FRP LOCK: ON) and OEM lock is on (OEM LOCK: ON). It was running Bootloader v2 on very recent stock firmware. It has been successfully flashed with BL_G955FXXU2CRED and AP_G955FXXU2CRED...
It was on G955FXXU2CRED firmware. I was able to successfully able to flash the Combination ROM COMBINATION_FA70_G955FXXU2ARE1 (full name COMBINATION_FA70_G955FXXU2ARE1_CL12792727_QB18097821_REV00_user_mid_noship.tar)
With combination rom, it seemed that I could enable USB Debugging, and also follow the steps for *#0808# IME to enable the appropriate mode for adb codes to be entered. I was able to find the device with 'adb devices', and I thought that the FRP unlock codes on the command line worked. But after re-flashing to the current Stock Firmware again, FRP lock was still there.
It seems I need to downgrade to Nougat 7.0, but I am on Bootloader V2. Odin identifies it by a FAIL with binary not matched (2 vs 1). So it seems that if I could get a method to keep Bootloader V2 and install Stock Firmware for Android 7.0 Nougat, I would be halfway there to fixing the FRP problem. However, I can't find any firmware or ROMs for G955F that includes Bootloader V2. This is identified by a U2 in the firmware name, like: G955FXXU2CRED . Is there a way to keep the BL Bootloader V2 but install AP ROM from Nougat?
I have spent many hours on this so far, and I just wanted to say thank you to all you guys who are helping on XDA, I really appreciate it. I have read about 7 day waiting periods for OEM UNLOCK but I don't see how it applies, as I can't do anything aside from use Combination ROM, use Odin, or go to the FRP locked FW which seems to be a dead end?
If there was a reliable method for rooting this G955F device with this G955FXXU2CRED firmware, I would be open to trying it.
Click to expand...
Click to collapse

anonan said:
It seems there are a few solutions to frp if you can selectively restore flash files. It looks like Samsung tool Pro can do this, but is there any free adb method?
http://forum.gsmhosting.com/vbb/f453/new-solution-remove-frp-s8-plus-sm-g955f-last-security-2422242/
Especially this http://forum.gsmhosting.com/vbb/f453/g955f-rev-2-frp-100-no-box-2417931/
Click to expand...
Click to collapse
It worked! Flashed the Comb file with Odin and do what he does in the video, then flashed the Stock G955FXXU2CRED and now its unlocked I dont know how i did this but its worked!

darknagel said:
It worked! Flashed the Comb file with Odin and do what he does in the video, then flashed the Stock G955FXXU2CRED and now its unlocked I dont know how i did this but its worked!
Click to expand...
Click to collapse
Excellent.

I still can't get this to work. Have you purchased Samsung tool Pro to do the flashing of individual boot files? What version?

Hi there. I already bypassed the frp.. If you need. Hp with android 8.0 even with the binary 2. I have some comb files and working stock roms through odin. Feel free to pm me via my email [email protected]. Thanks!

how
darknagel said:
It worked! Flashed the Comb file with Odin and do what he does in the video, then flashed the Stock G955FXXU2CRED and now its unlocked I dont know how i did this but its worked!
Click to expand...
Click to collapse
Hi
Can you let me know the steps as i am trying but i cant flash the stock firmware after the factory binary
thx

oz_ezekiel said:
Hi
Can you let me know the steps as i am trying but i cant flash the stock firmware after the factory binary
thx
Click to expand...
Click to collapse
Download latest odin and try again. I too got stuck in similar situation. Realised the issue is due to Odin. If you are using latest and encountered this error, try one version earlier.

I too can confirm that the combination-ROM works like a charm with odin. FRP kinda unlocked itself

samsung galaxy s7 custom binary blocked by frp lock

Greetings, ever since i tried rooting my phone, i knew something went wrong (i used cf autoroot).
So the first thing i noticed, i was asked to reset the phone or something similar to that, meaning i would lose all my data.
I tried to find a workaround as this had never happened to me before while rooting a phone, and someone had said that i was supposed to download twrp
and change some partition and then change it back. I dont remember what else he mentioned and what exactly i tried doing, i realised it was formatted either way and i had to start fresh. As i setup my phone i went and switched the oem unlock back to "off", as i did not wanna attempt to root again, but i hadn't realised that my phone was infact rooted sucessfully, leading me to my first error after restarting. "Custom binary blocked by frp lock", with absolutely no access to recovery mode at all anymore. Again, trying to find a workaround, i download some stockfirmware that i atleast had hoped was the right one for my phone, after a couple failed attempts of flashing with odin, ( i had gotten various different error messeges on download mode screen such as (REV Check fail device 7 binary 0 and others witch i cannot remember), now im getting a new error screen, stating that an error has occured while updating the device software. I cant flash twrp recovery as the frp lock is on, and the only thing i can guess is that im flashing the wrong firmware, but i cant find a matching code at all.
Its the following: sm-g930fzkadbt
IMEI: 35214310282955
on the back of the phone it says uk yateley, although the phone was purchased in germany.
Im not sure what to do anymore, any advice would be greatly appreciated.
PS: I have managed to get back to the old error screen with the custom binary info, this time with bootloop, by checking the deviceinfo box on odin

Yep you've now learned the hard way not to mess about and read the proper guides.
Anyway "dbt" is just unbranded german firmware. Download UK "BTU" and flash with Odin, it's UK unbranded.
FRP lock means you'll need to unlock the phone with the google account and password that was on it before you started messing about with it.
If you don't know the google email and password you need to read up on how to bypass FRP lock and it's a nightmare.

cooltt said:
Yep you've now learned the hard way not to mess about and read the proper guides.
Anyway "dbt" is just unbranded german firmware. Download UK "BTU" and flash with Odin, it's UK unbranded.
FRP lock means you'll need to unlock the phone with the google account and password that was on it before you started messing about with it.
If you don't know the google email and password you need to read up on how to bypass FRP lock and it's a nightmare.
Click to expand...
Click to collapse
Thanks for your reply, just a question, will any btu update work? Should i download latest android version btu firmware?
(Also yes, it was stupid of me to try and do it quick but i had rooted 3 different samsung galaxy phones in the past without issues, either i did something wrong or it took something way too specific to do the job, perhaps the phone's unrootable, but thank you either way) :fingers-crossed:

Elef244 said:
Thanks for your reply, just a question, will any btu update work? Should i download latest android version btu firmware?
(Also yes, it was stupid of me to try and do it quick but i had rooted 3 different samsung galaxy phones in the past without issues, either i did something wrong or it took something way too specific to do the job, perhaps the phone's unrootable, but thank you either way) :fingers-crossed:
Click to expand...
Click to collapse
You'll likely only find the last version of BTU think it was August 2019. It isn't updated officially anymore but it'll be fine to use.

cooltt said:
You'll likely only find the last version of BTU think it was August 2019. It isn't updated officially anymore but it'll be fine to use.
Click to expand...
Click to collapse
I've found android 6 to android 8 with all the monthly updates, im just trying the latest of the latest though i dont remember my android version, ill try android 7 and 6 if that doesn't work, thanks again. I'll make sure to reply if this works or doesn't.

cooltt said:
Yep you've now learned the hard way not to mess about and read the proper guides.
Anyway "dbt" is just unbranded german firmware. Download UK "BTU" and flash with Odin, it's UK unbranded.
FRP lock means you'll need to unlock the phone with the google account and password that was on it before you started messing about with it.
If you don't know the google email and password you need to read up on how to bypass FRP lock and it's a nightmare.
Click to expand...
Click to collapse
OK so i thought it worked but i can only enter recovery mode now and download mode, but cant actually boot the system, it just boots up the battery screen whenever i plug the charger, and never shows the actual battery info, just the thunder icon. Formatting from recovery mode doesn't help either (Note whenever i launch recovery mode it says installing update, then says no command and brings me to the recovery menu) Any ideas?
PS: It fixed itself. Sorry for the pointless edit.

How i ypass kg state :pre normal on galaxy a8 2018?

good guys, I need a lot of help, two days ago, I had the bootloader unlocked, since it came with a firmware from last year and the operator, I installed the latest firmware to get the operator logo and installed twrp , when i went to install the sabor rom, my phone crashed, and i came across samsung's message that i can't install unofficial binaries, i was forced to reinstall the stock and get stuck in it, without telling twrp. i wanted to know, how I exceed or circumvent the kg state: prenormal. this kg state stay in download mode and never comes out again. How do I overcome this and reinstall twrp? I really need your help!
if someone has a program or charges for the service, I pay, no problem, as long as it's cheap!

DJSZPILMAN said:
good guys, I need a lot of help, two days ago, I had the bootloader unlocked, since it came with a firmware from last year and the operator, I installed the latest firmware to get the operator logo and installed twrp , when i went to install the sabor rom, my phone crashed, and i came across samsung's message that i can't install unofficial binaries, i was forced to reinstall the stock and get stuck in it, without telling twrp. i wanted to know, how I exceed or circumvent the kg state: prenormal. this kg state stay in download mode and never comes out again. How do I overcome this and reinstall twrp? I really need your help!
if someone has a program or charges for the service, I pay, no problem, as long as it's cheap!
Click to expand...
Click to collapse
there are many guides in this thread describing how to do this. please thumb thru the previous posts and im sure you will find your answer. if you dont have any luck, feel free to reply to bump this thread to the top

Apparently the only way is by paid service but I don't know which...

Someone HELP!!!

Hi all,
I'm having a nightmare of a time with my Galaxy S7... For some unknown reason I decided to root my phone about 2 months ago using CF Auto Root.. worked great.. This morning, was having bad lag issues, so I restarted the phone.. as soon as the Samsung logo came up, I got a red message at the top of the screen saying "Custom Binary locked by FRP".. kind of freaked out and booted the phone into Recovery mode.. wiped Cache and wiped phone (to go back to factory setting I guess).. restarted... since then, I had no boot.. it did loop for a while as I was trying to charge the phone.. but that's it.
Now, the only way the phone will power on is if I plug it into my computer in Download Mode. I am trying to flash the ROM, custom or stock, but Odin fails almost as soon as it starts the sboot.bin and the phone screen shows "SW REV. CHECK FAIL (BOOTLOADER) DEVICE: 6, BINARY: 1".. Also, When I try to power on the phone, it HAS to be plugged in to my computer or charger cable and it just loops with a message at the top of the screen.
I can't do anything with this phone and cant find any solutions online... please help! :crying:
PM me for images of all screens please

I had the some problem while playing with my handset I switched off OEM unlock for some reason under developer option..
Next time i reset my handset it stuck on that warning
You need to download combination file, flash it with odin, then unlock developer mode, toggle OEM unlock, than flash back your current firmware, or if you have full twrp back up restore it

JayMor81 said:
Hi all,
I'm having a nightmare of a time with my Galaxy S7... For some unknown reason I decided to root my phone about 2 months ago using CF Auto Root.. worked great.. This morning, was having bad lag issues, so I restarted the phone.. as soon as the Samsung logo came up, I got a red message at the top of the screen saying "Custom Binary locked by FRP".. kind of freaked out and booted the phone into Recovery mode.. wiped Cache and wiped phone (to go back to factory setting I guess).. restarted... since then, I had no boot.. it did loop for a while as I was trying to charge the phone.. but that's it.
Now, the only way the phone will power on is if I plug it into my computer in Download Mode. I am trying to flash the ROM, custom or stock, but Odin fails almost as soon as it starts the sboot.bin and the phone screen shows "SW REV. CHECK FAIL (BOOTLOADER) DEVICE: 6, BINARY: 1".. Also, When I try to power on the phone, it HAS to be plugged in to my computer or charger cable and it just loops with a message at the top of the screen.
I can't do anything with this phone and cant find any solutions online... please help! :crying:
PM me for images of all screens please
Click to expand...
Click to collapse
This problem appears on the forum over and over. Its a direct result of not understanding what type of S7 you have and what you need to do before modification.
The error you have in Odin means the firmware you are trying to flash is older than the bootloader file on your device. You can never downgrade a bootloader only upgrade.
In your case you need to flash a firmware version 6 or above for your device. So if you have a branded T Mobile for example you will need to download and flash T Mobile firmware version 6 or above. The firmware must also be for your region where you live.
The FRP lock is because you didn't sign out of, or remove the Google account on the device before modification. Its a security feature. It will still appear after you've flashed firmware but as long as you know the email and password the phone will start fine.

cooltt said:
This problem appears on the forum over and over. Its a direct result of not understanding what type of S7 you have and what you need to do before modification.
The error you have in Odin means the firmware you are trying to flash is older than the bootloader file on your device. You can never downgrade a bootloader only upgrade.
In your case you need to flash a firmware version 6 or above for your device. So if you have a branded T Mobile for example you will need to download and flash T Mobile firmware version 6 or above. The firmware must also be for your region where you live.
The FRP lock is because you didn't sign out of, or remove the Google account on the device before modification. Its a security feature. It will still appear after you've flashed firmware but as long as you know the email and password the phone will start fine.
Click to expand...
Click to collapse
Dammit.. I tried to put as much detail as possible in there lol.. obviously I forgot some.. My mistake the Galaxy s7 that I am using is a Rogers Mobile (Canada) SM-G930W8. As for not signing out before modification, omfg, that makes perfect sense.. didn't even think of doing that before rooting.. I appreciate the help!! I will give this a go and see what outcome I get.. Thanks!

[/COLOR]That was nice of you to respond so helpfully, despite you having seen the scenario posted over and over.
cooltt said:
This problem appears on the forum over and over. Its a direct result of not understanding what type of S7 you have and what you need to do before modification.
The error you have in Odin means the firmware you are trying to flash is older than the bootloader file on your device. You can never downgrade a bootloader only upgrade.
In your case you need to flash a firmware version 6 or above for your device. So if you have a branded T Mobile for example you will need to download and flash T Mobile firmware version 6 or above. The firmware must also be for your region where you live.
The FRP lock is because you didn't sign out of, or remove the Google account on the device before modification. Its a security feature. It will still appear after you've flashed firmware but as long as you know the email and password the phone will start fine.
Click to expand...
Click to collapse

Can't make or receive calls
Please I need help my I rooted my S7 (flat) flashed the original OS with odin Installed Twrp flashed Andriod 9 and since then I can't make or receive calls wifi seems fine. Someone please come to my rescue:crying:

Cesilina said:
Please I need help my I rooted my S7 (flat) flashed the original OS with odin Installed Twrp flashed Andriod 9 and since then I can't make or receive calls wifi seems fine. Someone please come to my rescue:crying:
Click to expand...
Click to collapse
The S7 didn't receive Android 9 so the ROM is a custom one. Any issues with custom ROM's should be asked on the ROM thread itself where you got the ROM from. It's quite normal for custom ROM'S to have bugs.
You can try flashing the ROM (Android 9 Pie) again to see if it works. If not there are several different A9 ROM's to choose from.

cooltt said:
The S7 didn't receive Android 9 so the ROM is a custom one. Any issues with custom ROM's should be asked on the ROM thread itself where you got the ROM from. It's quite normal for custom ROM'S to have bugs.
You can try flashing the ROM (Android 9 Pie) again to see if it works. If not there are several different A9 ROM's to choose from.
Click to expand...
Click to collapse
Thank you for reply. I have tried atleast 4 different custom ROMs but to avail

Cesilina said:
Thank you for reply. I have tried atleast 4 different custom ROMs but to avail
Click to expand...
Click to collapse
Do you still have an imei number listed in settings?

Can't make or receive calls
cooltt said:
Do you still have an imei number listed in settings?
Click to expand...
Click to collapse
Yes please I still have an IMEI number

Need binary 3 software for Note7 N930F

Hey guys!
So I bought a note 7 N930F from a recycler a few months ago. When I got it it had a custom ROM
(presumably to remove charge limit) flashed. I was messing around in developer options one night and stupidly turned off OEM unlocking for some reason. When I went to boot it up I got "custom binary blocked by FRP" or something like that. I went and found a combination file (factory binary) and flashed it. Flashed no problem but now the issue I'm facing is OEM unlocking is nowhere to be found. I want to enable that so I can proper Android on the phone but it complains about the firmware being binary 2 while the phone is on 3. I know for a fact this phone has an unlockable bootloader as it had TWRP flashed when I got it and OEM unlocking enabled.
Now I'm not sure if this matters but the phone showed N9300 in settings as a model number however in download mode & factory binary it shows N930F.
So my question is where can I find the binary 3 firmware? I know it has many limitations but the main purpose is to disable FRP & enable OEM unlocking and it should do fine for that.
I've read another thread and it had download links for the firmware I need but unfortunately they're all dead links.
Any and all help is appreciated. Thanks!

hi,i have U3 firmware for N930F. This firmware only for unbrick device. Then you will need to install a custom rom