The search for a is a wild goose chase designed to infect desperate gamers with malware. Rockstar Games has not, and will never, release Grand Theft Auto V for the PlayStation Portable or as a 1 GB compressed file. The only legitimate paths to Los Santos are via PC, modern consoles, or cloud streaming services.
The short, direct answer is that
. Any "GTA 5 PPSSPP ISO" or CSO file found online is a fan-made modification (mod) . Modders typically re-texture and modify other PSP-era GTA games, such as GTA: Liberty City Stories or Vice City Stories , to create a "GTA 5-style" mobile experience. You will never find an authentic, full-fledged GTA 5 experience as a CSO file for the PPSSPP emulator. gta 5 cso link