While you might find a nutmeg-mini-itx rev 1.0 bios bin file for download on a third-party website or forum, . These files are often of unknown origin, could be corrupted, or may be malicious. You should always try to obtain the BIOS update directly from the manufacturer's official source.
If you are currently troubleshooting this specific motherboard, let me know: What is your system showing right now? nutmeg-mini-itx rev 1.0 bios bin file