Get the official PS3 System Update from Sony's website.
Legally, you are expected to provide your own BIOS file from hardware you own. From Original Hardware dump the BIOS directly from a PS1 console using specific tools. From PS3 Firmware : You can extract ps1_rom.bin from the freely available PS3 firmware updates on Sony's official site using tools like a batch script designed for this purpose. 3. Quick Setup Guide Regardless of the emulator, the file must be exactly and is often case-sensitive Extract Your Own PS2 & PS1 BIOS (No Console Required!) ps1-rom.bin bios
Unlike traditional BIOS files dumped from physical PS1 consoles (which are region-locked to US, EU, or JP hardware), ps1_rom.bin is a file. Get the official PS3 System Update from Sony's website