Sony PSP Homebrew hack maker Fanjita and Ditlew announced the beta release of eLoader for GTA that works on mostly all Sony PSP Firmware versions which include v2.0, v2.01 and v2.5.
eLoader is still beta quality, so it doesn’t run consistently every time and does not run as many homebrew applications due to the TIFF-based EBOOT Loader.
Fanjita has made quite a journey since the initial GTA exploit discovery to a firmware independent homebrew code loader. Now you can run for instance Super Nintendo, Sega Genesis or Atari Lynx emulators.
You would need to download Grand Theft Auto and the eLoader Beta for GTA to run Homebrew.