You will realize:

This article explores why the mythical "Modern Warfare PSP ISO" isn't real, how to get the closest experience, and why—if you find a hacked ISO—it is than any official UMD release for this specific game style. The Great Misconception: Why You Think This ISO Exists Let’s address the elephant in the room. Google "Call of Duty Modern Warfare PSP ISO," and you will find dozens of sketchy forums, YouTube videos with fake thumbnails, and Reddit threads from 2011. Why?

If you are searching for you are likely looking for a unicorn: a proper first-person shooter version of Modern Warfare running on Sony’s handheld. Officially, it doesn't exist. Modern Warfare 2: Force Recon is a strategy game. But the PSP homebrew and emulation community has spent 15 years trying to solve this problem.