Okay I was searching for some homebrew and I found one app with like 6 or 7 games in it (its like a mini PC). (i found this at PSPcave.com)
It does not require GTA! 2.0+ only!
It uses the psp's web browser, But you do not need to use the internet!
once you find it and download it (sorry i cant send a direct link)
Place the mcp folder into the psp's common folder and use the readme to set it up.
Wow So now homebrew can be made for 2.0+ (MAYBE) and above by using the browser but not using its internet :icon_bigg