There is no official Rockstar port of GTA 5 for the PSP.
The PSP was released in 2004 with a 333MHz processor and 32MB of RAM (64MB on later models). GTA 5 launched in 2013 for the Xbox 360 and PlayStation 3, requiring massive processing power, dedicated graphics chips, and gigabytes of system memory.
Native mobile ports of GTA III , Vice City , and San Andreas featuring updated lighting and controls. Android / PC (PPSSPP) Official ISOs of Liberty City Stories or Vice City Stories pspiso club gta 5 link
It is crucial to understand that a direct port of GTA 5 (released on PS3/Xbox 360 and later) is impossible on the original PSP hardware due to technical limitations. The PSP simply does not have the processing power, memory, or storage to run a game of that scale.
Open PPSSPP, navigate to the folder where you placed the .iso file, and click it to run. There is no official Rockstar port of GTA 5 for the PSP
The safest approach is to use official channels. Watch for legitimate promotions on Epic Games, Steam, or Rockstar's own launcher. Consider subscription services if you are already a member. Or simply wait for a seasonal sale — GTA 5 is frequently discounted, and the money you spend supports the developers who created the game.
: Small, highly limited indie projects built from scratch that feature a basic map and a controllable character, but lack the actual missions, physics, and world of GTA 5. Native mobile ports of GTA III , Vice
💡 If you want the most stable GTA experience on a handheld, GTA: Chinatown Wars
No. Homebrew developers cannot port a 70 GB game to a 64 MB RAM handheld.