Forza Horizon 4 is not a native PSP game and does not have an official ISO file for the PPSSPP emulator
If you want a high-quality, official racing experience on the PPSSPP emulator, these titles served as the inspiration for the mods: Test Drive Unlimited forza horizon 4 iso file for ppsspp patched
Performance: These files are optimized to run on the PPSSPP emulator on Android or PC, though they are not true "next-gen" graphics. Forza Horizon 4 is not a native PSP
There is no Forza Horizon 4 ISO for PPSSPP — patched or otherwise. forza horizon 4 iso file for ppsspp patched
There is no official Forza Horizon 4 ISO for the PlayStation Portable (PSP) or the PPSSPP emulator, as the Forza series is exclusive to Xbox and Windows platforms.