ASUS S451 BIOS image for board revision 2.0, read from a 25Q64 flash chip, delivered as a 3.25 MB RAR. A 25Q64 part holds 64 Mbit, which is 8 MB, so the extracted file should match that size. Repair technicians write it with an SPI programmer to recover laptops with corrupted firmware or no POST. Before programming, save the original chip data, check the chip marking and the rev 2.0 label on the PCB, and select the correct chip model in the programmer software.
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 →