"Stop! There's no such thing as a PS3 BIOS. 'PSemu3' is fake. The real PS3 emulator is RPCS3, and it doesn't use a BIOS—it uses the official PS3 firmware, which you download legally from Sony for free. Any 'PSemu3 BIOS' link you find will probably give you a virus. Stay safe and use RPCS3 instead."
And here's the key difference: like PS1/PS2. It uses official PS3 Firmware . psemu3 bios download
RPCS3.net