Lenovo BIOS firmware for board NM-C811, revision 10, in its AMD version, supplied as a ZIP. NM-prefixed codes belong to LCFC, the Lenovo-owned ODM that builds many IdeaPad and ThinkPad boards. An Intel board with a similar code would need different firmware, so confirm the AMD platform and the PCB number. Program the extracted image to the SPI chip with an external programmer to recover corrupted firmware, after backing up the original, and check that the file size matches the 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 @technodev_bios. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →