If done correctly, you will see (!) Present next to the required BIOS file names. If it says (!) Missing , re-verify your file path, spelling, and ensure the letters are entirely in lowercase. Troubleshooting Common BIOS Errors on PS Vita
If it says next to the filename, your BIOS is installed correctly. If it says Missing , RetroArch cannot find the file or the filename is incorrect. bios files for retroarch ps vita link