Warning: Manipulating BIOS files carries significant risk.
If you are certain the file is correct for your board, typical methods include: nutmeg-mini-itx rev 1.0 bios bin file
Example flashrom command (Linux):
sudo flashrom -p ch341a_spi -c "MX25L6405D" -w nutmeg-mini-itx-rev1.0.bin
If your board boots but has a buggy BIOS: Warning: Manipulating BIOS files carries significant risk
A valid nutmeg-mini-itx rev 1.0 bios bin file has specific characteristics: If you are certain the file is correct
Do not flash a file that does not match community-verified checksums.