BIOS for the C320R4 all-in-one, which uses the Quanta motherboard DA0QUAMB6E0, supplied as a 2.17 MB rar. The name does not state a board revision or whether EC firmware is included, so inspect the contents before use. Quanta DA0 codes identify the board project, and the revision letter is printed on the PCB next to the code. Read the original SPI chip with your programmer and keep that copy. Write this image only after checking that its 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 →