Firmware for a Lenovo C440 all-in-one, linked to the CIH61S2 motherboard version 1.0, supplied as a 3.43 MB RAR. The H61 in the board name suggests an Intel H61 chipset platform, but check the board itself. Make sure the board label and version match before flashing. Use an SPI programmer to read and keep the original chip contents first, then confirm the extracted image size matches the flash chip capacity, since a mismatched file cannot be written correctly.
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 →