Many third-party ROM sites hide malicious software inside compressed .zip or .7z archives instead of actual game data.

Before diving into files and installations, it is important to clarify a common misconception in the mobile gaming community. The PSP Library Reality

Software that floods your device with intrusive, unclosable ads.

Navigate to the folder where you extracted the ISO file ( Documents/PSP/Games ).

I can give you a step-by-step setup guide for your specific device.

To play the authentic Resident Evil 4 on Android, you should use emulators for the consoles it actually launched on, such as the PlayStation 2 or GameCube. Recommended Emulation Methods for Android

The absolute most important fact to understand is that

Navigate to your main device storage directory: Internal Storage -> PSP .