Working BIOS for Wistron board 17859-1, the variant fitted with an 8th-generation Intel Core i5 processor according to the name, stored in a 7.17 MB RAR archive. The (2) in the name suggests a second copy of the file rather than a different board. Make sure the board's CPU option matches before flashing, as other CPU variants of the same board may need different firmware. Write the extracted image to the SPI chip with a programmer, and back up the current contents first.
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 →