Use VitaShell to connect your Vita to your PC via USB or FTP. Locate the Folder: Navigate to ux0:/data/retroarch/system/ .
Ensure all filenames are lowercase . For example, SCPH5501.BIN should be renamed to scph5501.bin . RetroArch is case-sensitive and will not recognize uppercase filenames. How to Verify if Your BIOS is Working bios files for retroarch ps vita link
If you legally cannot dump a PS1 BIOS, consider: Use VitaShell to connect your Vita to your PC via USB or FTP
If you see “Missing,” double-check the filename case (lowercase is safest) and the folder path. consider: If you see “Missing