Did i do something wrong with game king 2019-in-1 multiboard?

Liquid Snake

I am untouchable
400-in-1 multigame card works great on my supergun, easy and simple plug-n-play.

Now i bought game king 2019. I hooked it up with my supergun and there's nothing showing on the screen?

Did i do something wrong? Manual is your worst friend because it didnt tell me anything.......