Second firmware archive for the NUTMEG-MINI-ITX board, revision 1.00, at 3.79 MB; the slightly larger size points to different contents or a different read of the same board. Nothing else about chipset or brand is given. When two versions exist, compare them in a hex editor and choose the one whose layout and size match your own chip. The image is meant for writing to the SPI flash with a programmer after a failed update. Keep a read of your original chip before overwriting it.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @afsbiosfree. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →