Working BIOS for a Dell Latitude on Wistron board 18717-1, provided as a 22.3 MB RAR archive. The exact Latitude model is not stated in the name, so identify the board by the number on the PCB. The archive size suggests a large image or several files, so inspect the contents and match each image to the size of the SPI chip it is meant for. Wistron's dash-suffixed numbering marks the ODM. Read and save the original flash before reprogramming with an SPI programmer.
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 →