BIOS archive for a board identified as HM55P, version 1.2, holding a 4 MB flash image. HM55 is an Intel mobile chipset name, so this most likely belongs to a laptop or small-form-factor board built around it, but the name gives no brand. Write the image to the SPI flash with a programmer to revive a board with corrupted firmware. Compare the label on the PCB with HM55P V1.2 first, save a backup of the existing chip, and confirm that the chip is 4 MB.
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 →