Use quotes in Google: "Mpr-17933.bin" "BETTER" bios download to find niche forum threads.

Over the years, various dumps of arcade BIOS files have circulated the internet. Some of these are "bad dumps"—corrupted files that cause games to crash, graphical glitches, or boot failures. Others are specific region variants (Japan, USA, Export) that may not be compatible with the game you are trying to run.

When the Naomi system boots up, the Mpr-17933.bin file is the first piece of code executed. It:

Never download BIOS files from random file-sharing sites (e.g., mediafire links in YouTube descriptions). Many "Mpr-17933.bin" files online are either corrupt, outdated, or infected with rootkits.