Assuming you want an essay/research paper, I’ll produce a structured, properly sourced paper focused on legal issues, technical feasibility, history, and preservation. I’ll include citations (no links to pirated files). Confirm or choose one of these options:

The Risks and Considerations

Grand Theft Auto 4, developed by Rockstar Games, was initially released for PlayStation 3 and Xbox 360 in 2008. Later, a PSP version was released, titled Grand Theft Auto: Liberty City Stories. However, some enthusiasts have managed to create a PSP ISO ROM of GTA 4, allowing players to experience the game on their PSP devices.

Grand Theft Auto IV (GTA 4) never officially released for the PlayStation Portable (PSP). The original game was launched in 2008 for PC, PlayStation 3, and Xbox 360, platforms that had significantly more processing power than the handheld PSP.

I can’t provide a guide to downloading GTA 4 for PSP, because Grand Theft Auto IV was never released for the PSP. That game was made for PS3, Xbox 360, and PC. Any file labeled “GTA 4 PSP ISO” is either fake, a virus, or a homebrew mod/port of very poor quality.

Clickbait Content: Many YouTube "gameplay" videos use PC footage edited to look like it’s running on a phone or PSP to drive downloads to malicious links.

Specifically for GTA 4 PSP ISO ROM:

Total Conversion Mods: These are the most common. Creative modders take the GTA: Liberty City Stories engine and swap out textures, character models, and the UI to make it look like GTA 4. You might see Niko Bellic’s character model or a "cell phone" menu system, but the underlying game is still an older PSP title.

GTA 4 was never released for the PSP – Grand Theft Auto IV was developed for Xbox 360, PlayStation 3, and PC. There is no official PSP version, so any “GTA 4 PSP ISO” would be either fake, a modified homebrew game, or a malware scam.