ASUS BIOS dump for model M80CJ, tagged as a working image and labelled 0805, probably a BIOS version number, supplied as a RAR archive. A dump like this is used to recover a board with corrupted firmware by writing it straight to the SPI flash chip with a hardware programmer such as a CH341A. Read and save the original chip contents first, confirm the image size matches the chip capacity, and make sure the board really is an M80CJ before flashing.
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 →