: Auto-scanning sometimes fails to link arcade ROMs correctly. In RetroArch , go to Import Content > Manual Scan , set the System Name to "FBNeo - Arcade Games," and point it to your ROM folder.
Scan your ROM folder. The tool will tell you exactly which files are missing or named incorrectly and can often rename them automatically to make them "known" again. 4. Avoid "Merged" Sets if You're a Beginner romset is unknown fbneo fixed