Q5 pro TV box - Background black can't change

[saeeddos]

I have Himedia Q5 Pro, I install Custom firmware Android 7 , something wrong happen (Power off white installation)  and then i return to android 5 but the original background is become black or without background, I can't put background or any thing.

Please help me to fix this issue.

[pcristi]

Many post explain how to fix  Black Background, please learn to use search button.

[saeeddos]

Thank for you prompt reply,

 What i meant to say black background is there not showing background just icons without background and i can not put background system not changing the background.

i try to search in forum but could not find.