: A common "hidden" fix found on the RetroPie Forum is placing both the game ROM and the neogeo.zip BIOS in the same folder, which helps the emulator verify the set more effectively.
3D arcade games or games not yet included in the FBNeo compatibility list will result in this message. How to Fix It FBNeo not working with "Romset is unknown" : r/RetroArch Romset Is Unknown Fbneo Fixed
When you see "Romset is unknown," FBNeo is telling you: "I do not recognize the specific combination of files inside this ZIP folder." : A common "hidden" fix found on the
These frontends use a hidden cache. After adding new ROMs: Romset Is Unknown Fbneo Fixed