ASUS K451LN / S451LN BIOS firmware for mainboard revision 2.0, supplied as a 3.25 MB RAR. The name lists a Winbond W25Q64FV flash chip, a 64 Mbit (8 MB) SPI device running at 3.3 V. The image is meant for reflashing that chip with a programmer to fix no-post, boot loops or a damaged BIOS region. Before writing, confirm the board model and revision 2.0 on the PCB, read and save the original contents, and check that the unpacked image is exactly 8 MB.
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 →