no official Resident Evil 4 ISO file for PPSSPP , as Capcom never released a version of Resident Evil 4 for the PlayStation Portable (PSP).

That being said, here's a working Resident Evil 4 PPSSPP ISO file download link:

While there is no official release of for the Sony PlayStation Portable (PSP), players can still experience the survival horror classic on their mobile devices using emulators and specialized mods. This guide explains how to find the right files and set up your device for the best performance. Is Resident Evil 4 Available for PPSSPP?

: Instead of PPSSPP, use a PlayStation 2 (e.g., AetherSX2) or GameCube (e.g., Dolphin) emulator. These platforms actually hosted the game, though you will need a higher-end device with 4–8GB of RAM to run them smoothly. Official Mobile Ports

Enter PPSSPP (PlayStation Portable Simulator Suitable for Playing Portably), an open-source emulator that allows users to run PSP software on modern hardware. The core component required to play these games is the ISO file—a digital replica of the game disc. This paper analyzes the phenomenon of "Resident Evil 4 PPSSPP ISO file download," moving beyond the simple act of downloading to understand the technical requirements for emulation and the complex copyright framework surrounding software preservation.