Zipped binary of 108 KB labelled as MEC firmware for the Lenovo ThinkPad W540, referring to the MEC1633 embedded controller that runs power-on sequencing, battery and thermal control. The name gives no board revision, so check whether your W540 carries a 12291-1 or 12291-2 Wistron board before use. A faulty EC can cause no-boot or no-charge symptoms, and reprogramming it requires a programmer that supports this Microchip part. Keep a backup read of the existing controller contents before writing anything.
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 @SCHEMATICWORLD. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →