ASUS X550JX BIOS firmware in a RAR archive of 3.19 MB, with no board revision or version noted in the name. Extract the image and compare its size with the SPI flash chip before programming. The X550 series spans several board variants and CPU options, so the revision printed on the PCB should match whatever the firmware was taken from. Save the original chip contents first, since serial number and LAN MAC are stored there.
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 @biosbigarchives. 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 →