Consequently, there is no official, native version of God of War 4 for the PSP. When you encounter websites offering a "God of War 4 PPSSPP ISO," you are actually downloading one of two things:
"I’m trying to play God of War on the PPSSPP emulator," Leo sighed. "I wanted to replay the classics— Ghost of Sparta and Chains of Olympus . But every time I search for the files, I end up on these sketchy websites. I click 'download,' and I get a weird APK instead of an ISO, or the file is corrupt, or it’s just... not right."