BIOS image for a Wistron-designed laptop board numbered 18836-2, with the PCB part code 448.0HE02.0021 also given in the name. The dump is marked as having a fixed ME region and is supplied as an outimage file inside a 5.99 MB RAR archive. Wistron boards follow this five-digit-dash-revision pattern, so confirm both the board number and the 448 code printed on the PCB before use. Read and save the original SPI chip contents with a programmer first, then write this image and check that its size matches the flash chip capacity.
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 →