Lenovo Miix 2 firmware for the DA0J02MBAI0 motherboard, a number following the Quanta scheme, so Quanta is the board maker. The 2.83 MB RAR contains the image for reflashing the SPI BIOS chip on a unit that will not boot after corruption. A DA0 code like this identifies the specific Quanta design, which helps rule out look-alike boards. Check the code silkscreened on the PCB, take a full backup of the chip with a programmer, and confirm the dump size matches the installed flash.
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 @afsbiosfree. 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 →