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PPSSPP does not need firmware updates to run games. If you try to "update" your PPSSPP BIOS with a 6.60 firmware file, you will break the emulator. The only time you touch firmware is if you want the official PSP "XMB" (home screen) inside the emulator, which is a separate, more advanced modding topic. ppsspp bios
Enjoy your PSP library in upscaled 4K, with save states, cheats, and external controller support. No BIOS required. 🎮 PPSSPP does not need firmware updates to run games