Lenovo firmware archive for motherboard NM-C631 revision 1.0, referencing the GL4A0 and GL5A0 board codes, which indicate the model variants it serves. The NM- numbering follows LCFC, Lenovo's own ODM. At 25.4 MB the RAR probably holds more than one image, so unpack it and pick the one matching your variant and chip. Before reflashing the SPI flash with a programmer, back up the original, check the revision on the PCB is 1.0, and make sure the image size equals the chip 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 @biosarchive. Enginerys does not host this file.
All sources (4)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @biosarchive | 17 Aug 2023 | Open file on RM Schematics |
| @generalbios | 12 Oct 2023 | Open file on RM Schematics |
| @generalbios | 26 Nov 2023 | Open file on RM Schematics |
| @generalbios | 4 Nov 2024 | Open file on RM Schematics |
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 →