Working BIOS for Wistron board 19476-1, packed as a 8.94 MB RAR archive, which the name says holds a 16 MB image. A 16 MB dump corresponds to a 128 Mbit SPI flash part, so check the chip on the board has that capacity. The OK tag means the dump was reported to boot after being written. Extract it and program the chip with a CH341A, RT809H or similar tool, ideally after removing it or using a clip. Keep a read of the original chip as a fallback.
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 @schematiclaptopramkushwaha. 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 →