Hi i have jus change my PSP firmware to 3.71 M33-2. However i am now unable to play ANY OF MY ISO game but able to play my CSO game. I have tried changing the UMD setting to NO UMD but till unable. When i try to start the game for my pro evo 2007 nth came out, jus black screen, while for my GTA ZIP.iso file, it is not shown on mem stick game. CAN any one help me pls?