Working BIOS for the ASUS X409JA laptop motherboard, revision 2.0, supplied as an 11 MB ZIP. Use it to reflash the SPI chip on a board that does not boot or shows a corrupted firmware. Before writing, read and keep the original dump, since it can contain serial and licence data you may want to transfer. Confirm the board revision matches 2.0 and that the image size equals the capacity of the flash chip fitted, then program and verify with an external programmer.
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 .zip file
Compressed archive that every operating system opens without extra software.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →