Tested working BIOS for the ASUS X420FA laptop, mainboard revision 2.1, intended for the version fitted with an 8th generation Intel Core i5 processor. ASUS boards often differ by CPU and memory configuration, so pick the image matching your hardware. Use it to repair a corrupted BIOS by writing it to the SPI flash with a programmer such as a CH341A, after reading and saving the existing content. Check the revision on the board and that the image size equals the flash chip capacity before programming.
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 →