Sometimes the ROM is "unknown" because the emulator is looking in the wrong place or permissions are blocked. RetroArch users: Settings -> Directories -> Downloads
It takes up more disk space but eliminates "Unknown" errors caused by missing dependencies. Common Troubleshooting Tips Check Your BIOS fbneo romset unknown
Ensure your ROMs are in the directory the emulator is actually scanning. Go to Options -> ROM paths Sometimes the ROM is "unknown" because the emulator
Now, go play Garou: Mark of the Wolves – once you fix that unknown error, of course. Go to Options -> ROM paths Now, go
Let’s walk through a real-world example: The Simpsons Arcade Game (4-player version).
Many arcade games (Neo Geo, CPS1, CPS2, PGM) require BIOS files. In FBNeo, the Neo Geo BIOS is expected to be in a file named neogeo.zip in the same folder as your ROMs. If your neogeo.zip is outdated or from MAME, FBNeo will reject every single Neo Geo game.