Mods of existing PSP games (like Syphon Filter or Army of Two ) that swap character models and textures to look like RE4.

Get the latest version from the Google Play Store or the official website.

Most fan mods come as .zip or .7z files. Use an app like ZArchiver to extract the .iso file.

Open PPSSPP, navigate to the "Games" tab, and select the folder where you saved the file. Recommended Settings for Stability