Firmware archive named only H55-M, a 715 KB rar without brand, revision or version. The same size as a related H55-M file suggests the same content. H55-M commonly refers to Intel H55 micro-ATX desktop boards made by several vendors, so verify the manufacturer and model on your PCB before flashing. Extract it, check the image matches the SPI chip size, and keep a backup read of the original chip with a programmer such as a CH341A 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 @biosarchive. 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 →