Full graphics display wont work

Hello

i have some very wird issus.

First i have a Creality 3D Afinibot A9 printer, it is a very fine one, and it fit my need. i have now startet to add some extensions on it. the first thing is that i have a full graphic smart controller, and not matter what i do, i just cant cant that display to show anything.

things that i have tried:
- uplaode std firmware
-- turned arround the cable
- uploade the newest marlin FW
-- turned arround the cables

nothing helps, and i have downloaded the need files as description tells. what the heck i am doing wrong....