If you are setting up an emulator, you have likely realized that a PS3 BIOS (or system firmware) is required to make it work. Here is everything you need to know about the PS3 BIOS download process, legalities, and installation. What is a PS3 BIOS?
Download the PS3 BIOS file from a reputable source. Make sure it's compatible with your console model. ps3 bios download