Because the BIOS contains copyrighted Sony code, it cannot be legally hosted on open-source emulation sites or mainstream marketplaces.

Because downloading raw BIOS files from random Google searches puts your device at risk of malware, you have two primary, safe options: 1. Dump it from your own PSP (The Legal Way) If you own a hacked PSP with custom firmware: Use a tool like on your PSP. Extract the popsman.prx file from the official 6.60 update.

If you are setting this up right now, let me know you are emulating on (like PC, Android, or a retro handheld) and what emulator you are using so I can give you exact folder paths or troubleshooting steps. Share public link

: This usually means the BIOS file name is incorrect. Ensure the file is named exactly PSXonPSP660.bin (case-sensitive on some systems).

Go to your PSP's . Ensure you are running Custom Firmware 6.60 (e.g., 6.60 PRO-C2). If you are on 6.61, you need the 661 version instead.