Toshiba firmware archive for Quanta board DAH98DMB8B0, revision B, with CFG in the name, which may indicate configuration data or a particular image set. Packed as a 5.92 MB ZIP, it should be inspected to see which files it contains before you use anything. Quanta's DA board code is printed on the PCB and should match together with the revision letter. Back up the existing SPI chip with a programmer first, and make sure any image you write matches the chip size exactly.
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 →