i didnt see a thread reguarding this guide so i am posting it now.
should probably be a sticky.

i have a t-mobile sm-g998u on wk1 default stock rom for my (s21 ultra).
i followed the guide up to the spot where he says "Disable child app restriction"
on my s21 ultra i do not have that opting.
in that same area (right above the "logging level" area in the same spot as disable child app restriction) i have "Disable app compatibility policies".
i did try and (enable) it but the result is the same thing as if it was default disabled.
BLACK SCREEN with Mouse.

what do we do to fix this?