If you want a "high quality download" of any PSP game (including the ones listed above), follow these legal steps:

If you want to play actual GTA IV on a portable device, do not use a PSP. Instead, use a modern smartphone or PC:

If you have landed on this page, you are likely a fan of the iconic Grand Theft Auto series. You own a PlayStation Portable (PSP), a smartphone with a powerful emulator, or a PC, and you are searching for the elusive "GTA 4 PSP ISO ROM High Quality Download."

You have probably seen dozens of YouTube thumbnails claiming to show Niko Bellic driving through Liberty City on Sony’s handheld. Before you click that download button, you need to understand the hard technical truth, the risks of fake files, and how to actually get a high-quality GTA experience on the go.

This is the closest you will get to the GTA IV vibe. Set in 1998, it features the same Liberty City map (based on New York) that would later be remastered for GTA IV. You play as Toni Cipriani, a mobster working for the Leone family. The story is dark, the radio stations are fantastic, and it runs flawlessly on PSP hardware.

If you want to play a GTA game on your PSP using an emulator (PPSSPP) or original hardware, stick to the official "High Quality" titles that were actually designed for the system:

1. Grand Theft Auto: Liberty City Stories

2. Grand Theft Auto: Vice City Stories

3. Grand Theft Auto: Chinatown Wars