BIOS firmware for the ASUS M5A78L-M PLUS/USB3 desktop motherboard, with 0502 in the name, which appears to be the BIOS version. The small 812 KB RAR archive contains the image that can be written to the board flash chip with a programmer, or used to recover a board left dead by a failed update. Before writing, dump and keep the current chip contents, verify the exact board model and USB3 variant on the PCB, and confirm the image size matches the flash 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 →