Tested BIOS for the ASUS K46CM, also sold as A46C, on the K46CM main board revision 2.0, in a 4.09 MB ZIP. ASUS often shares one board between models, which explains the A46C reference, but the revision printed on the PCB should still read 2.0. A known-good image like this is used to rewrite the SPI flash with a programmer on boards that show no POST after a failed update. Extract it, check that its size equals the chip capacity, and save a full read of the existing chip before erasing anything.
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 .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 →