BIOS archive for the LKL-2 mainboard numbered 18724-1M, a Wistron pattern board used in the Lenovo ThinkPad L390, labelled as a fully working dump. The working status claim comes from the name only, so verify it yourself. Before writing, read and save the original SPI flash with a programmer, compare file and chip sizes, and confirm the PCB marking reads 18724-1M. Note that serial data and keys stored in the original chip may need transferring.
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 →