Lenovo BIOS binary for board NM-D521, supplied as a 16 MB raw image. The NM-prefix follows the LCFC numbering used for Lenovo laptops designed by that ODM, and the board code is usually printed near the edge of the PCB; the name gives no model, revision or version. A 16 MB image suits a 128 Mbit SPI flash chip, so check capacity before programming. Back up the original chip with a programmer first, because it can carry serial, UUID and other unit-specific data that a generic dump will overwrite.
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 @bioshub. Enginerys does not host this file.
How to open a .bin file
A raw, byte-for-byte image of a flash chip: the main BIOS / UEFI, the embedded-controller (EC) firmware, or both.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →