NM-B891 BIOS Dump 32MB
Part of NM-B891
10 BIOS files for NM-B891 are indexed here. The board is used in the Lenovo ThinkPad T490S and Lenovo ThinkPad X390. Image size: 32 MB. Flash chip noted in the file names: MX25L25633F. 7 of them are marked as tested by the uploader. Board revisions: 2.0 and 1.0.
BIOS files 10
FileSizeRevAddedSource
From the uploader
FT491 FX390 NM-B891 REV 2.0 2019-01-28 32MB
MEC1663
TYPE-C
FT491 FX390 NM-B891 REV 2.0 2019-01-28 BIOS & TYPE-C & MEC 32MB &1MB & 256KB BIOS WORKING 100%
Laptops that use NM-B891
What these files are for
A BIOS dump is a full image of the board's SPI flash chip. It is written back with an SPI programmer when the original firmware is corrupted, after a chip replacement, or to recover from a failed update. Read and save the original chip first: serial number, DMI data and the Intel ME / AMD PSP state differ between boards.
Tools to open these files
| Format | What it is | Open with |
|---|---|---|
| .rar | RAR archive | 7-Zip or WinRAR |
| .zip | ZIP archive | 7-Zip, WinRAR or the built-in Windows extractor |
| .bin | BIOS image inside the archive (usually .bin) | a CH341A, XGecu T48 / TL866II Plus or RT809H programmer |