WonderSwan v5.2: Color Only?

[bownser]

Hi! I've just received my Flash Masta v5.2
But I don't seem to know how to make it work.

I've flashed some games on it, but when I turn the WSC on, only some of the right side icons show up, the rest of the screen blank.
Sometimes it seems I can select a game? Because it starts playing some music, but there's nothing on the screen.

Is it possible the WSC I've bought is busted? The listing said fully working

Would appreciate any help, I'm sure it is just some usability issue on my part

Thanks in advance!

EDIT: LMAO THERE'S A CONTRAST WHEEL SORRY for my confusion I'm new ;__;