Small 128 KB firmware file with no extension, labelled only as an EC region, with no model, brand or board number in the name. It most likely holds embedded controller code, which on laptops handles power-on, battery charging, keyboard and fan control. Because the target hardware is not identified, inspect it with a hex editor and compare it against a known-good dump before writing anything. Never flash unverified EC firmware onto a board, and always save the original contents of the chip first.
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 @bioshub. Enginerys does not host this file.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →