emulator doesn't actually use a traditional BIOS file. Instead, it requires the official PlayStation 3 System Software (firmware) to function.
Go to File > Install Firmware in the top menu. Ps3 Bios For Rpcs3 --39-LINK--39-
Unlike older console emulators (e.g., PCSX2 for PS2), RPCS3 does not require or use a PS3 BIOS file . The PS3’s boot process is fundamentally different: emulator doesn't actually use a traditional BIOS file
If you need a link to the (which you can legally download directly from Sony’s servers), I can provide that — just let me know. PCSX2 for PS2)
You download a “PS3 BIOS” for RPCS3 — any such file circulating online is fake or for other purposes (e.g., PS3 hardware flashing).