BIOS dump for a Wistron-designed motherboard numbered 18836-2, with the PCB part number 448.0HE02.0021, in a 19.2 MB RAR archive. The name also includes A1 and CML, where CML most likely refers to the Intel Comet Lake platform. Wistron board numbers like this appear on several laptop brands, so identify the board by the PCB markings rather than by the model name. Before writing the image with an SPI programmer, back up the existing chip contents and check that the image size matches the capacity of the flash part.
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 .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 →