Rockstar Games never developed or published GTA IV for the PSP. The PSP’s hardware limitations (333 MHz CPU, 64 MB RAM) cannot run the GTA IV engine (RAGE physics engine, detailed open world, complex AI).
Since this is a community-created project and not an official Rockstar Games product, its quality can vary significantly.
If you are looking for an authentic open-world crime experience on your PSP, you should stick to the official releases:
Grand Theft Auto IV was never officially released for the PSP, as the console lacked the hardware to support the high-fidelity game developed for Wikipedia . Instead, fans often use mods for GTA: Liberty City Stories on the PSP, which are available as Amazon and Amazon UK to emulate a similar experience.
While the full game doesn't exist on the platform, dedicated modders have created projects that attempt to bring the aesthetic of GTA 4 to the PSP:
These ISOs are often designed for use with the PPSSPP Emulator on Android or PC. On actual PSP hardware, they can be prone to crashing or significant lag because they push the handheld beyond its original design. Legitimate Alternatives for PSP
that swap textures, cars, and menus to mimic the GTA IV aesthetic.
Use this if you are pointing out that "GTA 4 PSP ISOs" found in random download clubs are usually fake.