If you are using on a PlayStation Vita or specific custom firmware (CFW) setups on a PSP, you might encounter a "missing BIOS" error. Updating or installing this file provides several benefits:
Ensure the filename is exactly psxonpsp660.bin . If your Windows settings hide file extensions, make sure you haven't accidentally named it psxonpsp660.bin.bin . Black Screen on Boot download psxonpsp660bin upd
Are you setting this up specifically for on a Vita or for a standard PSP ? If you are using on a PlayStation Vita