The only 100% legal way to obtain the BIOS is to dump it directly from your own physical PlayStation console using a homebrew tool. Conclusion
Because every PS1 game relies on these low-level system instructions to communicate with the hardware, modern emulators cannot run games accurately without a copy of this software. Why Emulators Require a BIOS File ps1 bios archiveorg link
If you want a smaller download or prefer a clean folder structure, this pack is perfect. The only 100% legal way to obtain the
💡 Modern emulators like DuckStation are often "region-free" if you provide a high-quality BIOS like the SCPH-5501 or SCPH-5502, which are known for being the most stable versions. How to Install the BIOS ps1 bios archiveorg link