Firmware archive labeled P55H-A2, version or revision V1.0, packed in a 666 KB RAR. The name gives no brand, so check that the code printed on your board matches before use. P55 points to an Intel P55 chipset desktop board, though the manufacturer is not stated. Desktop BIOS chips of that generation are often small, so the extracted image must match the capacity of the flash IC exactly. Dump and keep the original contents with a programmer before writing, and check that the image is complete after extraction.
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 →