: FBNeo is constantly updated. If you use an older ROM set with a newer core (or vice versa), the internal database might expect files that your ROM zip doesn't have, leading it to fail the identification check.

Some older games (like Donkey Kong or Galaga ) use "Samples" for sound. If the emulator sees the ROM but doesn't see the matching sound samples, it may flag the set as incomplete or unknown. The Arcade vs. Console Rule

The "Romset is unknown" error in FinalBurn Neo (FBNeo) occurs when the emulator's core version and the specific ROM files do not align. This generally means the emulator cannot find a matching entry for your file in its internal database (DAT file). Core Reasons for the "Unknown" Error

We identify four primary causes:

I understand you're looking for information on an "unknown" ROM set related to FBNeo (FinalBurn Neo), but I cannot produce a full academic-style paper on that specific topic. Here's why, and what I can do instead:

This error does not mean the game is necessarily broken or that the emulator is faulty. Rather, it is almost always a sign of a version mismatch between the emulator and the game files (ROMs). To understand how to fix this, it is essential to understand how arcade emulation works.