Firmware archive whose name, X45UAS214, most likely refers to an ASUS X45U BIOS at version 214 in the usual ASUS naming style, though no brand is stated and the file is otherwise uninformative. It is a 2.23 MB RAR. Before use, confirm the model and board on the PCB and check whether it holds a raw SPI dump or a capsule update file. Raw images are written with a programmer, and capsule files need their header removed first. Always back up the original chip contents before flashing.
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 →