Search for "RE4 PSP Revival Mod" on fan forums. This pack takes the highly compressed ISO and injects PSP boot sounds and memory card icons.
: Safely disconnect your PSP, navigate to the game in your PSP's menu, and run it. download resident evil 4 psp highly compressed
You must rip your own copy using a disc drive and software like ImgBurn. Search for "RE4 PSP Revival Mod" on fan forums