Archive for the Lenovo ThinkPad L480, machine type 20LT, 5.35 MB in RAR format. The name gives the model and type but not the contents, which may be a BIOS package, service data or board documentation. ThinkPad L480 units are built on LCFC boards, so a related schematic or boardview would carry an NM-numbered board code. Before using any firmware from it, confirm the machine type on the bottom label and the board number on the PCB, and make a full read of the original flash chip.
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 @schematiclaptopramkushwaha. 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.