I purchased a psp on ebay from Hong Kong. The manual was in japanese so I assume it's a japanese psp. The firmware is 1.5. I've downloaded and installed Devhook 0.46 Ultimate Installer. I have tried to load 2 ISOs on my memory card so far with no luck. With both of them, I get a message saying either: "This game cannot be started. The game data is corrupt" or a message along the lines of the game being from the wrong region. Can I only play japanese game ISOs on this? If so, what region is that? are there any psp ISOs that will play on any system? What is the difference in Multi5, Multi6, Multi7, etc Any help appreciated.