If you cannot obtain the 6.60 version, consider these alternatives:
Used to fix "BIOS missing" errors and improve stability in demanding titles like Final Fantasy . psxonpsp660.bin bios file
For weeks, he had been trying to get his old PlayStation games to run on the portable system. He had stumbled into the world of Custom Firmware, a digital underground where terms like "Popstation" and "ISO" were the native tongue. He had the games ripped. He had the memory stick formatted. But every time he tried to boot Castlevania: Symphony of the Night , he was met with a black screen and a cold, digital silence. If you cannot obtain the 6
Always attempt to dump the BIOS from your own PSP running official 6.60 firmware if you want to stay 100% legal. However, if you choose to download it elsewhere, verify the MD5 checksum (the correct MD5 for a clean dump is c89128f7ecf6eb972e0a96e98606194e ) to ensure you haven't downloaded a corrupted or malware-ridden file. He had the games ripped