The short answer is . Grand Theft Auto IV was never officially released for the PlayStation Portable, and a true, uncompromised version of the game cannot run natively on the handheld's hardware. Hardware Limitations
Characters may look like Niko, and vehicles might resemble those from GTA 4 .
If you own GTA 4 on PC, you can stream the game to a hacked PlayStation Vita or a modern mobile phone using Moonlight or Steam Link, giving you the portable experience using your PC's hardware power.
If you are looking for top-tier GTA action on your PSP or Android device using the PPSSPP emulator, you should look for the official titles.
If you find a site or club offering a "GTA 4 ISO" for the PSP, here is what you are likely encountering:
If you are determined to try a GTA 4-themed mod on your PSP, follow these safety tips:
GTA 4 received widespread critical acclaim for its engaging storyline, improved gameplay mechanics, and detailed graphics. However, it's worth noting that the game was not officially released for the PlayStation Portable (PSP).