BIOS firmware for the ASUS X450JF laptop, associated with the Wistron board number 12279-2. Wistron uses this five-digit-dash pattern for mainboards it manufactures for ASUS and other brands, and the number on the PCB is the best way to confirm compatibility. The RAR is intended for SPI flash recovery using a programmer when the laptop will not POST or after a corrupted update. Read and store the original chip contents first, confirm the chip capacity agrees with the image size, and keep any serial or MAC data from the old dump.
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 →