BIOS dump for a board labelled T-HM55D-V2.1, which likely means version 2.1 of an HM55-based board, though the name gives no brand or device. The name states a 4 MB image, and it is stored in a 1.29 MB RAR. The image is meant for writing to a 4 MB SPI flash chip with a hardware programmer. Before flashing, compare the PCB label, check the chip capacity and keep a backup of the original contents, because an image of the wrong size or for another board will not work.
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 →