Hacking Homebrew PS1 emulation on PSP

[Deleted User]

You apparently forgot to put the keys.bin file in the directory of your psx game. And yes, as far as I know you don't need a UMD when playing a PSX game but I may be wrong on this. It's been quite some time since I used my PSP the last time.

src: http://forums.maxconsole.net/showthread.php?t=41060