[Q] Downgrade success, but...?

[Guest Edgmal]

Used downgrade method with bootloader "hack", successfuly, installed b927 and then restored IMEI which i backed up at b926. So now then to remove chinese splash screen (white with orange writtings), runned vendor update.

Is it possible to instal other stock ROMS like b934, because through update.app it fails? I just now wanna completelly wipe everything and flash freshly on normal IMEI, or i cant, since i have the same bootloader as in b926, where you cant flash anything that easy? And why Huawei did that with b926...