Hi, this is my first post here so if I put it in the wrong place, sorry.

I need help making my gpsphone work. I have an iphone 3GS on v4.2.1 jailbroken through greenpois0n. I downloaded gpsphone through cydia from xsellize and got the bios too. I got a few games but when I try to play them it shows the controls but the game doesn't show, only a black screen and after a few seconds it exits. Anyone know what to do?