Click on from the top menu, then select BIOS Settings . Look for the BIOS Directory path. Move your psxonpsp660.bin file into that designated folder.

Here is the breakdown:

While the iconic Sony PlayStation diamond logo and synth chime trigger intense nostalgia, they add extra seconds to every game launch. Because the PSP's internal emulator was built to launch games instantly, the PSXonPSP660.bin bypasses the traditional cold-boot sequence. Your games will boot up instantly, getting you into the action much faster. 4. Enhanced Emulation Stability

The original PS1 BIOS was written in the mid-1990s for specific, stationary console hardware. The 6.60 PSP BIOS was rewritten in the 2010s to maximize efficiency on portable hardware. This results in faster boot times and lighter CPU overhead, making it ideal for low-powered emulation devices like the Raspberry Pi, older smartphones, or budget handheld consoles (Anbernic, Miyoo, etc.). 2. Region-Free Compatibility

If your file matches this MD5 hash, it is a perfect rip and will work flawlessly with all compatible emulators. Final Thoughts

: Internally, it is often identified as System ROM Version 4.5 (dated 05/25/00), which is newer than the standard consumer hardware releases. Usage in Emulators

: If the emulator says the BIOS is "not found" or "invalid," ensure the filename is exactly psxonpsp660.bin and that the file size is exactly Black Screen

Go to the seplugins folder on your memory stick ( ms0:/seplugins/ or ef0:/seplugins/ on PSP Go).