Oreo or Nougat recovery - STF-L09 - Honor 9 Questions & Answers

Hi all,
Currently running Oreo (via OldDroid manual update) then LOS 15.1 (Berkley unofficial) on top, which is great but would like NFC, buttons, flashlight.
What is the best method to reinstate this functionality? I have tried the rollback for OldDroid rollback to no avail. I believe this method assumes you are rooted, which i am not.
Happy to be on EMUI 5 if necessary as i believe i can now update to Oreo OTA.
Cheers

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Can i provide further pertinent information or ask elsewhere to get replies?

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What did you do in the fist place to go from stock oreo to LOS 15.0 ; any links ?

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Thank you.
I flashed the system image using "fastboot flash system system.img" via article https://www.xda-developers.com/lineageos-honor-view-10-huawei-mate-10-pro-project-treble/
Cheers

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I think, once unrooted, you'll have to flash back stock system.

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oslo83 said:
I think, once unrooted, you'll have to flash back stock system.
Click to expand...
Click to collapse
Great, thank you. I am not rooted so I extracted the system.img from STF-L09SC432B360a (from http://pro-teammt.ru/firmware-database/?firmware_model=STF-L09&firmware_page=0) using this guide https://forum.xda-developers.com/mate-10/how-to/guide-extracting-stock-firmware-files-t3756733
Then using that stock emui 8 system image:
"fastboot flash system system.img"
I receive the following error:
error: cannot load 'SYSTEM.img'
Any ideas?
Cheers

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Another attempt at system.img extract using my windows box and the windows software referred to in https://forum.xda-developers.com/mat...files-t3756733.
This time i was able to flash the system.img successfully. When the device booted, it boot looped 3/4 times then i received :
Huawei eRecovery :
"Serious problems occurred when the phone boot, you are recommended to do factory data reset
NOTE: user data will be wiped after recovery".
I performed this reset and device booted to TWRP some commands took place but too quick (saw selinux buts thats it). Device rebooted twice then loaded Huawei eRecovery where the only option is :
Download latest version and recovery
Restore system with wifi
Entered wifi details
Getting package info from server
Getting package info failed.

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Booting into TWRP the 'Factory Reset' option performs the same process that i saw when Huawei eRecovery recommended the factory data reset. Some i'm confident in what happened at that point now. Unsure as to what to try at this point. The phone does not boot into EMUI and will only boot to Huawei eRecovery.
The bootloader is unlocked, as per the process to install LineageOS 15.1 in the link in the OP. I've not checked if its still unlocked, but guess that could be causing a problem?

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Just checked and bootloader is unlocked.
Interestingly the process to re lock it from the Huawei site (https://emui.huawei.com/en/unlock_step) shows that you have to use the same command to lock the bootloader as to lock it again:
Note: to re-lock the bootloader after unlocking it, restore the device’s software to the Huawei official version using a microSD card then switch the device to fastboot mode and enter “fastboot oem unlock ****************” in the computer’s command prompt, where * refers to the 16-digit unlock password. The device will then restart, and the bootloader lock status will change to “Bootloader Lock State: RELOCKED”.
If i follow those instructions i get the below error:
Code:
fastboot oem unlock **************** <-my 16 digit code
...
FAILED (remote: already fastboot unlocked)

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Stop trying to lock your bootloader, it won't help you. Interresing info though.
Did it occur to you that after flashing back successfully system.img it could have been good to flash back stock recovery over twrp ?
This way you would have bootloop 3 or 4 times, and then stock recovery would have launch, not twrp.
I think a format system from this stock recovery, not twrp, would have solve your problem.

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Thanks. So I can leave the boot loader unlocked at this point and run stock emui? I'll flash stock recovery. Perhaps that will suggest factory reset and then I'll be able to boot.
Thanks again.

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oslo83 said:
Stop trying to lock your bootloader, it won't help you. Interresing info though.
Did it occur to you that after flashing back successfully system.img it could have been good to flash back stock recovery over twrp ?
This way you would have bootloop 3 or 4 times, and then stock recovery would have launch, not twrp.
I think a format system from this stock recovery, not twrp, would have solve your problem.
Click to expand...
Click to collapse
In order to revert to the stock recovery is it necessary to flash all three recovery images from the update.app file? :
recovery_ramdisk
recovery_vendor
recovery_vbmeta

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Looking at flashing the recovery_ramdisk image with the stock version i have extracted using the below:
Code:
fastboot flash recovery_ramdisk RECOVERY_RAMDISK.img
Noticed the stock recovery_ramdisk i extracted has a filename of 'RECOVERY_RAMDIS.img', not ending in 'K' for 'RAMDISK. Presumably i can simply rename my recovery_ramdisk to "RECOVERY_RAMDISK.img" unless a 15 character filename is a limitation, or adjust my fastboot command to :
Code:
fastboot flash recovery_ramdisk RECOVERY_[B]RAMDIS[/B].img

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Code:
fastboot flash recovery_ramdisk RECOVERY_RAMDIS.img
Did the trick to boot back into EMUI 8. However, i still have an intermittent torch/flashlight and the navigation keys/buttons do not work.
Any ideas on where i go from here?

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mightyjcb said:
Code:
fastboot flash recovery_ramdisk RECOVERY_RAMDIS.img
Did the trick to boot back into EMUI 8. However, i still have an intermittent torch/flashlight and the navigation keys/buttons do not work.
Any ideas on where i go from here?
Click to expand...
Click to collapse
Follow instrucTions of this post: https://forum.xda-developers.com/showpost.php?p=75772700&postcount=2
and you will have all working again in B360 ;
This time while on bootloader:
fastboot flash kernel KERNEL_B360a_TOUCH_FIX.img

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oslo83 said:
Follow instrucTions of this post: https://forum.xda-developers.com/showpost.php?p=75772700&postcount=2
and you will have all working again in B360 ;
This time while on bootloader:
fastboot flash kernel KERNEL_B360a_TOUCH_FIX.img
Click to expand...
Click to collapse
Many thanks @oslo83 followed that and just as you said hardware functioning correctly once again!
One further question for future reference, am i now in a position to apply OTA updates when released?
Cheers

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You'll need to be unrooted and with stock recovery for applying ota when it will be available.
I don't know if you'll need stock kernel for ota...

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mightyjcb said:
This time i was able to flash the system.img successfully. When the device booted, it boot looped 3/4 times then i received :
Huawei eRecovery :
"Serious problems occurred when the phone boot, you are recommended to do factory data reset
NOTE: user data will be wiped after recovery".
Click to expand...
Click to collapse
You need to flash stock recovery and do a factory reset in stock recovery.

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oslo83 said:
You'll need to be unrooted and with stock recovery for applying ota when it will be available.
I don't know if you'll need stock kernel for ota...
Click to expand...
Click to collapse
Great, i should be able to meet this criteria quite easily then :
+ I've never rooted the device
+ I have reverted to stock recovery
+ I flashed the stock kernel over the top of the button fix kernel mentioned earlier in this thread.
Thanks again for your help, much appreciated.

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zxz0O0 said:
You need to flash stock recovery and do a factory reset in stock recovery.
Click to expand...
Click to collapse
That seemed to do the trick! Ta.