because the game was never released for the PlayStation Portable (PSP). Any files claiming to be the "official" latest ISO for PPSSPP are either fan-made mods of older games or potentially harmful software. The Truth About "GTA 5 PPSSPP"
Many websites promising a "300MB GTA 5 PPSSPP ISO" are viruses or survey scams. If the file is smaller than 800MB, it is fake. Never run .exe files on your phone. because the game was never released for the
Extract the (Save Data/Textures) included in your download. Copy the extracted folder. If the file is smaller than 800MB, it is fake
To make these heavy texture mods run smoothly: Copy the extracted folder
. Since Rockstar Games only released GTA 5 for high-power platforms like PC, Xbox, and PlayStation (starting with PS3), the original game cannot run on a PSP engine. What you often find online under this name are typically: Modded Versions of PSP Games : These are actually GTA: Vice City Stories Liberty City Stories