Firmware file named MBPNDBU144-0920 in a 3.53 MB RAR archive, sold as a BIOS image. The name has no brand, model or board revision, and the code cannot be decoded with certainty. It may be a version string or a date stamp. Before using it, check the contents and compare any identifiers with the target board. Read and save the original flash with a programmer, and make sure the image size matches the chip.
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 →