For power users, the only way to fix a specific ROM without re-downloading the whole set is to use a ROM management tool like or ClrMamePro .
Understanding why this happens is the first step toward fixing it. The most common culprits include: romset is unknown fbneo
The "Romset is unknown" error is a version mismatch. To fix it, ensure your and your ROM Set are from the same time period. For the best experience, always use a ROM set specifically curated for FinalBurn Neo. For power users, the only way to fix