Firmware archive for the Lenovo ThinkPad X1 Nano Gen 1, model 20UN-001TCD as named by its source; no board number or revision is stated. Roughly 9.5 MB in RAR form, it is intended for restoring the BIOS SPI flash with an external programmer when the laptop is bricked. Because ThinkPad images can hold machine-specific data such as serial and UUID, read and keep the original chip contents first, confirm the motherboard matches, and check that the image size equals the chip capacity.
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 @biosdumpcomputer. 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 →