BIOS dump for the ASUS X421FL mainboard at revision 2.0, marked OK, which usually means it was tested and works. The archive is 10.8 MB and should be extracted before you check the image size against the SPI flash chip. Technicians write such files with a CH341A, RT809 or similar programmer to fix boards that power on with no display or have corrupted firmware. Save a full backup of the original chip first, since it holds serial numbers and other unique data, and confirm the board revision matches.
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 @pkbiosbdv. 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 →