Zipped BIOS or firmware image labelled GGCN28WW, a version string in the style Lenovo uses for its BIOS releases, though the name identifies no model or board. The archive is 5.08 MB and presumably holds a single binary dump. Before flashing it with an SPI programmer such as a CH341A, verify which machine it belongs to, read and save the original chip contents, and compare the image size with the capacity of the flash chip on the board, because a mismatched dump will not fit or will not boot.
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 @vinafix_bios. 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 →