BIOS dump shared by the Lenovo ThinkPad E480 and E580, both built on LCFC motherboard NM-B421 revision 1.0, stored in a 4.66 MB RAR archive. The name carries a trailing tag with no clear meaning, and a second NM-B421 dump dated 2017-10-30 also exists, so compare the two before choosing. NM-B numbers are LCFC, Lenovo's own ODM. Verify the PCB marking, read and save the existing SPI chip with a programmer, and confirm the image size matches the chip capacity before flashing.
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 @afsbiosfree. 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 →