Firmware archive labelled C21_VC 1, 2.89 MB in ZIP format, with no brand or model in the name. C21 VC appears to be a board or project code, since a related file pairs it with the PW-MN491 marking. Before flashing, open the archive, check the image size and compare the board markings on the PCB. Technicians use such dumps with an SPI programmer to recover boards with damaged BIOS, and they always read the existing chip first so the original can be restored if needed.
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 →