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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

Flash update from other region with firmware finder

So before I brick my phone trying this can I flash an update from another region using firmware finder?
My phone is c782 and on 9.0.0.160 but for c432 9.0.0.197 is out.
Firmware finder says it's authorised for install which I would do via erecovery/hotspot with DNS change
I'm not trying to rebrand and don't have unlocked bootloader.
Will this work?
Edit
No. It doesn't work

Darrenc81 said:
So before I brick my phone trying this can I flash an update from another region using firmware finder?
My phone is c782 and on 9.0.0.160 but for c432 9.0.0.197 is out.
Firmware finder says it's authorised for install which I would do via erecovery/hotspot with DNS change
I'm not trying to rebrand and don't have unlocked bootloader.
Will this work?
Edit
No. It doesn't work
Click to expand...
Click to collapse
I'm on c432 and for me it was perfectly possible to flashba C782 firmware. Then why wouldn't this work in the opposite direction?

Dunno had the getting package info failed error and gave up then. I've used FF before so k ow my setup works normally.
Is your bootloader unlocked?

Darrenc81 said:
Dunno had the getting package info failed error and gave up then. I've used FF before so k ow my setup works normally.
Is your bootloader unlocked?
Click to expand...
Click to collapse
Was unlocked ?. A week ago hardbricked my phone and in the recovery process installed a wrong oeminfo. Now I have other imei's than original.....

Oh man that sucks.
I've given up with this phone decided to just see if and when updates are released then wait for a new handset from a different manufacturer. Not sure what yet, I like the Huawei devices but can't support the way they lock customers down. It's like having an iPhone back lol

Darrenc81 said:
Oh man that sucks.
I've given up with this phone decided to just see if and when updates are released then wait for a new handset from a different manufacturer. Not sure what yet, I like the Huawei devices but can't support the way they lock customers down. It's like having an iPhone back lol
Click to expand...
Click to collapse
Huawei is trying to copy Apple in every aspect.....

I managed to eff up my IMEI as well. Now showing as 00000000000000. What a waste of money this turned out to be ?
curtricias said:
Was unlocked . A week ago hardbricked my phone and in the recovery process installed a wrong oeminfo. Now I have other imei's than original.....
Click to expand...
Click to collapse

Help J7 SM-J737A

So I just got my new ATT samsung J7 2018 and after searching i have not found a root or bootloader unlock method for the devices. Is there any work being on this device ? Could some one maybe point me in the right direction to get root on this device ?

ramious2012 said:
So I just got my new ATT samsung J7 2018 and after searching i have not found a root or bootloader unlock method for the devices. Is there any work being on this device ? Could some one maybe point me in the right direction to get root on this device ?
Click to expand...
Click to collapse
I have been searching for this for 1week now...and its all cause in " Dev Option " the ( OEM is Hidden ). Atleast im stuck in this part with this phone cause the rest i know with Odin.

I just got this phone a few days ago and I'm already looking for a root as well. I found one post on a root for this phone, but I kinda doubt it's legit. If you search 'Samsung galaxy SM-J737A root' on google, it should be the first search results. I'm keeping an eye on these forums for now.

ramious2012 said:
So I just got my new ATT samsung J7 2018 and after searching i have not found a root or bootloader unlock method for the devices. Is there any work being on this device ? Could some one maybe point me in the right direction to get root on this device ?
Click to expand...
Click to collapse
I have serach it just like that before and try afew of this Tricks but still wont show me the OEM option in Dev. That one with setting the date to 10 to 7 days before wont work cause i dont have that " Manual Software Update " option. I aint working atm so im like full searching away.:laugh:

anybody had any luck with this?

bigTINY779 said:
anybody had any luck with this?
Click to expand...
Click to collapse
Still of this moment No luck. Saw today with a so called Box Z3x something that works good ( the hack version that dosent use the actuall box ) but this Devi e Model Version wont showup.....

If you see KG STATUS: checking or if it's not there after the wait time then you shouldn't need to use the OEM unlock option
Original recovery post for the J7 2017
https://forum.xda-developers.com/ga...fm-g-gm-x-samsung-galaxy-j7-pro-t3835629/amp/
https://mega.nz/file/fFFSxALD#1nOVnhF0k6vojg19bK60YCSugHH4LPULdmhYx-wHhP0 here is the J7 2017 recovery that should work since the 2018 model is the exact same but minor screen differences (I do not take credit for this recovery I'm just supplying the link)
It should flash without issues as the bootloader should already be unlocked

TheExploitedOne said:
If you see KG STATUS: checking or if it's not there after the wait time then you shouldn't need to use the OEM unlock option
Original recovery post for the J7 2017
https://forum.xda-developers.com/ga...fm-g-gm-x-samsung-galaxy-j7-pro-t3835629/amp/
https://mega.nz/file/fFFSxALD#1nOVnhF0k6vojg19bK60YCSugHH4LPULdmhYx-wHhP0 here is the J7 2017 recovery that should work since the 2018 model is the exact same but minor screen differences (I do not take credit for this recovery I'm just supplying the link)
It should flash without issues as the bootloader should already be unlocked
Click to expand...
Click to collapse
The file in that link doesn't work anymore. Do you have another one by any chance?

p30 ele-l29

hello
i got a new p30 (bought online) with a build version 9.1.0.102 (c900e102R1P16)
but i cant find anything about this version. Update manager doesnt give any updates.
Also is there a way to check if this was used before or installed other rom or its brand new as it should?
regards

which v. of the p30 is? ele-L09 ? L29? or other?
look up this at "system info"

version is ele-l29 ,
also in special menu shows vendor hw country normal

wpjohn13 said:
version is ele-l29 ,
also in special menu shows vendor hw country normal
Click to expand...
Click to collapse
Install Hisuite on your PC and check for updates via that with the phone connected to USB

*Detection* said:
Install Hisuite on your PC and check for updates via that with the phone connected to USB
Click to expand...
Click to collapse
no updates available but im guessing should be at least security updates
is this normal? security patch says february1, 2019
C900 what region is?
can be flashed to something else?

wpjohn13 said:
no updates available but im guessing should be at least security updates
is this normal? security patch says february1, 2019
C900 what region is?
can be flashed to something else?
Click to expand...
Click to collapse
Hi m8,
Usually C900 is the version of the cust that gets flashed another firmware from another device and messes it up. Was your phone bought from a retailer? Do you have an option to return it and get an replacement?
If not, you can try to flash on it this firmware from C432 cust (it's an global firmware used on many custs on EMUI 9.1) and see if it get's any uodates after you flash it. For info about flashing using dload firmware, see my post about from here #791.
HUAWEI P30 ELE-L29 HW EU HLRCF ELLE-L29B 9.1.0.193(C432E4R2P2) FIRMWARE 9.0.0 R3 EMUI9.1.0 05015SFK
Feel free to ask if you need more assistance
SilviuO

did the above worked? i have almost the same firmware build c900e106r1p16 ele-l29

followed SilviuO answer and updated to that version but again cannot get any new updates. As long as you cannot unlock the bootloader you will stuck at this and all updates would be done manually when available from other members.

wpjohn13 said:
followed SilviuO answer and updated to that version but again cannot get any new updates. As long as you cannot unlock the bootloader you will stuck at this and all updates would be done manually when available from other members.
Click to expand...
Click to collapse
what firmware are you in now?

ill have to check as i put it back into the box as i probably resell/send it back as i dont want it when no updates will be available and no warranty

wpjohn13 said:
ill have to check as i put it back into the box as i probably resell/send it back as i dont want it when no updates will be available and no warranty
Click to expand...
Click to collapse
what country are you in? if the bootlaoder is truly unlocked i would be interested in purchasing it

tylerboboy said:
what firmware are you in now?
Click to expand...
Click to collapse
now is 9.1.0.193 c900e102r1p16

tensux said:
what country are you in? if the bootlaoder is truly unlocked i would be interested in purchasing it
Click to expand...
Click to collapse
both phone/frp are locked
if it was unlocked i would flash it to a normal region

wpjohn13 said:
both phone/frp are locked
if it was unlocked i would flash it to a normal region
Click to expand...
Click to collapse
wishful thinking on my part, i wonder how they got the custom firmware on it before they sold to you

tensux said:
wishful thinking on my part, i wonder how they got the custom firmware on it before they sold to you
Click to expand...
Click to collapse
There are 2 options:
1. It was a VOG unit intented to be used by the on-line/offline testers or some reviewers and usually those tests devices has C900 cust (in that case it means NO OTA or other updates);
2. It had another cust and used paid services (as Funky Huawei) to flash firmwares and flashed a wrong one whitch f####d up the cust and without unlocked bootlader you can't change it or rebrand it
Sent from my VOG-L29 using Tapatalk

SM-A205U (MetroPCS) OEM Unlock

Hello,
Just wanted to share this with the community as I found this just yesterday. If you goto your settings and click connections then "More connection settings" towards the bottom there is an option for "Network Unlock". I did this like I said yesterday and it permanent unlocked the phone. I don't have any other SIM cards to try and see if it will go on a different network but just wanted to point this out to the community!
~DJ

djdeath15 said:
Hello,
Just wanted to share this with the community as I found this just yesterday. If you goto your settings and click connections then "More connection settings" towards the bottom there is an option for "Network Unlock". I did this like I said yesterday and it permanent unlocked the phone. I don't have any other SIM cards to try and see if it will go on a different network but just wanted to point this out to the community!
~DJ
Click to expand...
Click to collapse
That's not an OEM unlock, you've only unlocked the SIM card lock.

Into the sun you go

I wondered if this was either effecting, &or blocking or stopping oem unlock from showing or being visible? Just a thought.

ATGkompressor said:
I wondered if this was either effecting, &or blocking or stopping oem unlock from showing or being visible? Just a thought.
Click to expand...
Click to collapse
It's our specific model.
There are no 205u units in public domain that exist with an oem toggle.
It's disabled by default in the 205u source.

The only way this might be possible is with combination firmware but in all my searching so far i have yet to find bootloader 5 combination firmware ...
If anyone can find me a bootloader 5 android 10 combination firmware for the 205U varient i would be willing to see if there would be a way to get this rooted and bootloader unlocked

https://www.full-repair-firmware.com/2019/08/Combination-a205u.html

physwizz said:
https://www.full-repair-firmware.com/2019/08/Combination-a205u.html
Click to expand...
Click to collapse
Has everything except binary 5, probably gonna be waiting on that for a while

ninjasinabag said:
Has everything except binary 5, probably gonna be waiting on that for a while
Click to expand...
Click to collapse
Bin 4 won't work?

physwizz said:
Bin 4 won't work?
Click to expand...
Click to collapse
It would help for anyone still on pie if we could flash it.
Anyone who upgraded to Q would be in the cold for now.

i cant use bin 4 on my device because i upgragded to android 10 already on it so i couldnt even test to see if it was possible thats why im looking for combo firmware bootloader 5

ninjasinabag said:
It would help for anyone still on pie if we could flash it.
Anyone who upgraded to Q would be in the cold for now.
Click to expand...
Click to collapse
Yo I got this phone and figured it's a paperweight until root aka on Android 9 installed magisk manager , zarchiver and combination file matching numbers. Here is where I'm at a lack of expertise cuz magisk won't install enough to feed it the boot.img. Please Help Anyone:silly:

ddougg said:
Yo I got this phone and figured it's a paperweight until root aka on Android 9 installed magisk manager , zarchiver and combination file matching numbers. Here is where I'm at a lack of expertise cuz magisk won't install enough to feed it the boot.img. Please Help Anyone:silly:
Click to expand...
Click to collapse
The combination file is from an older bootloader, so it retains the most recent bootloader to maintain integrity of the Qfuse.
That's kinda why we want the combination file for 10, the bootloader hasn't changed which means the file would be universal for anyone who updates.

ninjasinabag said:
The combination file is from an older bootloader, so it retains the most recent bootloader to maintain integrity of the Qfuse.
That's kinda why we want the combination file for 10, the bootloader hasn't changed which means the file would be universal for anyone who updates.
Click to expand...
Click to collapse
yo Ninja I found the latest firmware with the u5 bootloader . It won't let me upload , bummer. I'll try again tonight. help

ddougg said:
yo Ninja I found the latest firmware with the u5 bootloader . It won't let me upload , bummer. I'll try again tonight. help
Click to expand...
Click to collapse
Do you have a link or anything to the source? I'll check it out and test when home

Ninja Do you have an email I could send the files to? Mega is being itchy bout an account from 3years ago and drive wants to copy my entire laptop,

I have the 205U as well I never could get antything to work I tried Odin and Magisk did not work I do have Android 10 as well I just look at the fix website I dont know what to do there or it would work with my latest vversion of my phone willl shoud I try to use it and would it be done it hasd 5 fixes that need to be installed ?

U is Unrootable

techmanc said:
I have the 205U as well I never could get antything to work I tried Odin and Magisk did not work I do have Android 10 as well I just look at the fix website I dont know what to do there or it would work with my latest vversion of my phone willl shoud I try to use it and would it be done it hasd 5 fixes that need to be installed ?
Click to expand...
Click to collapse
At the moment, all U devices are unrootable.

Try this
https://forum.xda-developers.com/galaxy-a20/how-to/a205-bootloader-unlock-twrp-root-t4189197