Avoid names like SCPH5501.BIN , scph-5501.bin , or scph5501.bin.bin (which happens if Windows hides file extensions).
Sony released different BIOS versions for different regions: scph5501.bin missing
Would you like a step‑by‑step guide for a specific emulator (DuckStation, RetroArch, or ePSXe)? Avoid names like SCPH5501