Modern Combat 4: Zero Hour is a legendary mobile FPS, it was never officially released for the PSP . This means there is no official ISO file to run on the PPSSPP emulator

of existing PSP games or is deceptive. If you are looking for a similar "console-quality" shooter experience on PPSSPP, you should explore authentic PSP titles that actually exist for the platform. Top PPSSPP Alternatives to Modern Combat 4 Since MC4 was designed to mimic the Call of Duty

style, these official PSP games are your best legitimate options on the emulator: How to play multiplayer games with PPSSPP - GitHub

Content claiming to offer "Modern Combat 4 for PPSSPP" typically refers to fan-made mods