Version F1 BIOS for the Gigabyte GA-H81M-S board, a 4.00 MB file whose extension encodes the firmware release, following Gigabyte's usual naming. F1 is the earlier release, and a later F2 file also exists. The image size corresponds to a 4 MB flash chip, so it can be programmed directly with an external SPI programmer when recovering a board with corrupted firmware. Make sure the model matches exactly and read out the original chip before writing anything.
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 @laptopschematics. Enginerys does not host this file.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →