Firmware for the ASUS UX31LA series, apparently the UX31LAA model with BIOS file F1211, in a 3.28 MB ZIP archive. The name gives no board number or chip capacity, only the model and version, so confirm them on the motherboard. A file like this can be written to the SPI chip with a programmer, though ASUS update files may need header stripping or padding before they fit the chip. Always save the original contents first, as they hold serial and product data.
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 @efibios. 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 →