BIOS firmware for the Lenovo ThinkPad T480, board ET480 with number NM-B501 at revision 1.0, packed as a 7.95 MB RAR. The NM- numbering belongs to LCFC, the ODM behind many Lenovo boards. Such an image is written to the SPI flash with an external programmer to revive a board with corrupted firmware. Match the board number and revision on the PCB to NM-B501 Rev 1.0, back up the original chip before writing and check that the image fits the flash 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 @biosfilebins. 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 →