Firmware release 3.20 for the H-CUPERTINO-H61-UATX desktop board, an Intel H61 micro-ATX design, packed as a ZIP of about 3.5 MB. It appears to be a later build than the 3.10 image of the same board. A full SPI dump like this is used to restore a corrupted BIOS region with an external programmer when the board will not POST. Back up the existing chip before erasing it, and check that the file length matches the flash capacity, otherwise it will not fit correctly.
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 @biosarchive. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →