Ok, i have a 3.40 oe-a system software. now all my isos and stuff work just fine. But when i try to play GTA LTS (the UMD), i get the error code 80020148. and when i try to play the nba live 07 demo a black screen comes and i have to take out my battery. I heard of this error code before, but it was for isos... what about actual UMD's? Any help really appreciated.