NM-B861 – Lenovo RT1WL-3
The Lenovo RT1WL-3, Lenovo ThinkPad X1 and Lenovo ThinkPad X1 Carbon are built on the NM-B861 board designed by LCFC. 8 files are indexed for this board: 6 BIOS files, 2 schematics and 1 EC firmware image.
Revisions seen in file names: 1.0 and 0.2. The BIOS dumps are 32 MB images. ODM project name: FX490. The earliest file dates from December 2021 (BIOS Archive, Schematics & Boardviews Archive and Cyberlan Electronics).
BIOS dumps 6
Schematics 2
Board facts
| Board number | NM-B861 |
|---|---|
| Designed by | LCFC |
| Platform group | NM-B |
| ODM project | FX490 |
| Revisions | 1.0, 0.2 |
| BIOS chip size | 32 MB |
| First seen | 2021-12-28 |
| Source channels | BIOS Archive, Schematics & Boardviews Archive, Cyberlan Electronics |
| About the number | LCFC is Lenovo's joint venture with Compal; its main boards use NM- numbers and sub-boards NS- numbers. |
Laptops that use NM-B861
- Lenovo RT1WL-3
- Lenovo ThinkPad X1
- Lenovo ThinkPad X1 Carbon
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.
A schematic is the circuit diagram of the main board: power rails, power-up sequence, component values and net names. It is the reference for measuring voltages and tracing a fault.
EC (embedded controller) firmware runs the keyboard controller, power sequencing, battery charging and fans. Depending on the board it lives in a separate chip (ENE KB9012, ITE IT85xx, Nuvoton NPCE) or inside the main SPI image, so check which applies before flashing.
Tools to open these files
| Format | What it is | Open with |
|---|---|---|
| PDF schematic | any PDF reader; Sumatra PDF and Foxit handle large schematics well | |
| .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 |
Questions
Who designed the NM-B861 board?
NM-B861 is an LCFC board number used by Lenovo.
Which laptops use the NM-B861 board?
Files in the catalog link NM-B861 to the Lenovo RT1WL-3, Lenovo ThinkPad X1 and Lenovo ThinkPad X1 Carbon.
Is there a boardview for NM-B861?
No boardview has been indexed for NM-B861 yet; the schematic is available on this page.
What BIOS chip size does NM-B861 use?
The BIOS images for NM-B861 are 32 MB.
Where do the download links go?
Each button opens the original public Telegram post the file was shared in. ChambersDesignInc.com only indexes and cross-references those posts.