Major update,
I managed to flash android 8, 9, 10, gsi roms but all Aosp phh.
I tried android 11 but just got stuck on the Tecno logo.
I am now running android 10 phh Aosp but I needed to flash phh magisk which installed old super user but now I can't root my phone because of it.
I tried other methods but phh magisk was the only one I got which could help me boot android 10.
By the way, I tried other roms like lineage os, dot os, and havoc os but only AOSP worked.
I anyone would like to know how.. comment and I will do what I can............
THANK YOU SO MUCH HOVATEK for all your help I will post screen shots in my next post.