My "short" experience with Huawei:
I had a bad past experience in the long past with bootloader ("verification", i didn't know that time...) and I left it.
Then I became experienced with Samsung and Xiaomi.
However, I was given recently a wet H9L with damaged PCB (phone was for 2 years off and idle/not any update...). I switched PCB with a new one from China (4GB/64GB) with a view to finally make use of PotatoNV and Unlock!
So I just "customised" only software apps, installed Termux, took some photos etc. (emui 8.0.0.0 & android 8.0.0.0), and the 2nd day I left it with its new PCB up and running, for just charging (wifi was connected)...
BUT suddenly I show the erecovery screen (!) and -my mistake- I chose to do the update ending up with the photos I attached here... However, I did manage to fastboot in the device and query for further info:
(I didn't even check before for build number etc... I didn't imagine of a possible (?) "forced" update, after 2 years of no use. I was planning for a PotatoNV/Unlocking later...)
MODEL: LLD-L21
fastboot oem get-build-number
(bootloader) :LLD-L21 8.0.0.122(C636)
fastboot getvar vendorcountry:
vendorcountry: hw/spcseas (=ASIA)
fastboot oem oeminforead-CUSTOM_VERSION
FAILED (remote: 'Read oeminfo failed!')
fastboot oem oeminforead-SYSTEM_VERSION
(bootloader) :LLD-AL00 8.0.0.189(C00)
fastboot oem get-bootinfo
(bootloader) locked
fastboot oem lock-state info
(bootloader) FB LockState: LOCKED
(bootloader) USER LockState: LOCKED
fastboot oem get_hwnff_ver
(bootloader) Ver2.3
fastboot oem check-rootinfo
(bootloader) status :SAFE
(bootloader) version :
(bootloader) current status: SAFE
(bootloader) old status : SAFE
fastboot oem oeminforead-ANDROID_VERSION
(bootloader) :8.0.0
fastboot oem oeminforead-SYSTEM_VERSION
(bootloader) :LLD-AL00 8.0.0.189(C00)
fastboot oem get_bootFail_ver
(bootloader) Boot_Ver1.1
fastboot getvar rescue_version
rescue_version: rescue0.6
fastboot oem check-image
(bootloader) secure image verify fail
fastboot oem backdoor info
FAILED (remote: 'Command not allowed')
Before these fastboot commands I tried the SD dload method with various android 8/9 UPDATE.APPs. Lastly I found a russian "Leland-L21A 8.0.0.122(C636) Firmware Android8.0.0 EMUI8.0.0 05014XCA.zip" very close/identical to mine. But never had I a success.
So by recalling here previous pages my final question is:
As far as I get in fastboot, is the easiest way of fixing it the PotatoNV try?
I think I can try it with testpoint & ground and the like... in order to Unlock the bootloader and install some (official) stock. I wish to avoid fastboot flash partition one by one (maybe HuRUpdater?)
Or is it better to order a new PCB (35 euros) and experience the same "forced" update problems?!
Finally, I fully realise that an unlocked bootloader is NOT necessary for flashing official distros.
But not in my case possibly...
If someone wishes to reply, I'd like to thank him/her very much...!