Ensure your ROMs match the version of FBNeo you are using.
The "romset is unknown" error in FBNeo is not a bug; it is a feature of precision. Arcade emulation respects the exact hardware of the original PCBs. A single wrong byte of sound data can cause the game to crash, so FBNeo refuses to run incomplete sets. romset is unknown fbneo fixed
Here is a proper technical essay on the subject. Ensure your ROMs match the version of FBNeo you are using
: In RetroArch, use the Manual Scan tool and select the FBNeo Arcade DAT to ensure the playlist points to the correct core. romset is unknown fbneo fixed