Firmware dump for a board numbered DABU1MMB6A0, with U305 noted in the name, most likely the reference designator of the flash chip on the PCB. The DA...MB numbering follows the Quanta pattern, so the board was designed by Quanta regardless of the laptop brand. The RAR archive is only 580 KB, which points to a small chip such as an EC or keyboard-controller flash rather than a main BIOS. Verify the chip marking and capacity before programming, and keep a backup of the original contents.
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 →