BIOS files for an HP 15-da series laptop on board DA0U81MB6C1, revision C, with separate 4 MB and 1 MB images according to the name, in a 3.5 MB RAR. The DA0 pattern is Quanta's numbering, and the 6C1 ending marks the PCB revision. The two images are probably meant for two flash chips or regions, so check which chip each targets. Back up both originals with a programmer, confirm the board number and revision match, and verify each file size equals its chip capacity.
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 →