"...this tool only works with Japanese PSPs, for now. But if you’ve got one or can get your mitts on one, you can use this Elf to PBP convertor tool to run code compiled for the PSP. The elf2pbp software converts the compiled code into a PBP file that can be executed from a memory stick when placed in a subdirectory of PSP/GAME. The other catch is that your Japanese PSP cannot be flashed to version 1.5. Yeah, lots of caveats on this one but still — it’s a start..."