Lenovo firmware archive, 14.3 MB RAR, named after the Macronix MX25U25672G SPI flash chip, with no model or board number given. The name points to a 256 Mbit, 32 MB chip that runs at 1.8 V. Use a programmer with a 1.8 V adapter, because a 3.3 V programmer can damage the chip. Extract the archive, check the image size against the chip capacity, and confirm which machine it came from. Always save your own chip contents before writing anything to it.
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 @technodev_bios. 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 →