BIOS firmware for the ASUS X421FL motherboard, revision 2.0, stored in an 11.0 MB RAR archive. The name does not say what the image contains or whether it has been tested. Technicians use such a file to reprogram the SPI flash when a laptop shows no image, loops on power-up or fails after a bad update. Confirm that the board is the X421FL at REV 2.0, back up the existing chip with a programmer, and check that the image size matches the flash chip before you write it.
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 →