Embedded controller firmware for a Lenovo board NM-C121, although the file name itself says only EC. The tiny 42.6 KB archive holds the EC image that handles power sequencing, the keyboard, battery charging and the fan. A corrupted EC typically causes no power-on or a dead keyboard. NM numbering belongs to LCFC, Lenovo's design subsidiary. Confirm the board label on the PCB is NM-C121. Read the existing EC or SPI contents with a programmer before writing this file.
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 →