Ok I jsut recently bought a 4gb card so I can download and play ISOs on my PSP. I spent 4 hours last night and 2 hours today trying to get this to happen. Only thing I was able to accomplish was Downgrading my psp from 2.71 to a clean 1.50. After doing that I tried many things, I installed the new 3.40 OE-A firmware correctly and tried running my game. The game appeared on my memory stick on the game icon, but when I ran it, it looked like it was starting then gave a can't load game error. Then I installed the Devhook can tried again and the same thing happened. I need someone to give me a step by step to running an ISO on 1.50 off the memory stick. I've looked everywhere on a proper guide but all of them only show half the process or make me install the wrong thing. Can anyone please help me out.