KBEC embedded controller firmware for the ThinkPad L490, which the name links to board B461 revision 1.0. The EC manages power buttons, charging, the keyboard matrix, and fan control, so a corrupted image often shows up as a board that will not start or charge. Program it with an external tool only after reading and storing the original contents. Confirm the board identifier and revision printed on the PCB match. The archive is about 129 KB, consistent with a small controller image.
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 →