Because Modern Warfare 2 was built for home consoles and PCs, a direct port does not exist on the PSP system. Instead, the game files available online are total conversion mods. Modders typically take an existing PSP first-person shooter—such as Call of Duty: Roads to Victory or Medal of Honor: Heroes —and completely overhaul the assets. They inject textures, weapon models, maps, user interfaces, and audio tracks directly from the original 2009 Modern Warfare 2 to recreate the experience on mobile hardware. Technical Specifications and Requirements

The "highly install" experience is about maximizing what is possible: crisp visuals, smooth 60 FPS, custom MW2 soundtracks, and familiar weaponry. It’s a tribute to one of the greatest shooters ever made, running on hardware that never officially saw it.

The only official Call of Duty title developed for the PSP was Call of Duty: Roads to Victory

Tap the Call of Duty: Modern Warfare 2 game icon to boot the title. Optimal PPSSPP Settings for Smooth Performance