Watch how the only official Call of Duty for PSP performs on the PPSSPP emulator:
If you want the true Modern Warfare 2 experience, the official version is available for PC and consoles, or through the Call of Duty: Modern Warfare 2 Campaign Remastered Call of Duty Call Of Duty Modern Warfare 2 Ppsspp Download
The PlayStation Portable (PSP) received three main Call of Duty titles: Watch how the only official Call of Duty