I see, thanks, i did not know that, thats cool.
As for black screen...well its a eShop version of Tekken game "Tekken 3D: Prime Edition" there is a cartridge one (a phisical copy) but i wanted to have it on emunand.
I installed cia file with BigBlueMenu (i use that one), it was fine, i played it a little to test it...than other day it wont work but other games work (some dont, but they did not worked the first time unlike tekken)
i now this is offtopic, and if its a problem you can write me in inbox if you want.