NM-A421 – Lenovo ThinkPad T460S
NM-A421 is the LCFC main board used in the Lenovo ThinkPad T460S. 11 files are indexed for this board: 8 BIOS files and 3 schematics.
Revisions seen in file names: 3.0, 1.0 and 4.0. BIOS images are 16 MB. ODM project name: BT460. First posted in November 2020 in BIOS Archive, Schematics & Boardviews Archive and Cyberlan Electronics.
BIOS dumps 8
Schematics 3
From the uploader
LENOVO T460S BT460 NM-A421 REV 4.0 2016-04 HF TYPE 20HG UNLOCK BIOS 100%
Unlock T460S patched-OK TESTED AND WORKING 100%
Remove all battery and CMOS battery
press F1 to enter setup: password 1234
wait 20sec or more.
Enter any ID to hardware Id.
Press 2x space bar when asked.
Turn off the computer.
and restore your original bios .
Enjoy.
If 2x 5beep, it's normal.
Wait minimum 30sec before screen logo light on. Must turn on/off several times by itself.
bios archive team
Board facts
| Board number | NM-A421 |
|---|---|
| Designed by | LCFC |
| Platform group | NM-A |
| ODM project | BT460 |
| Revisions | 3.0, 1.0, 4.0 |
| BIOS chip size | 16 MB |
| CPU generation | Intel 6th gen |
| First seen | 2020-11-02 |
| 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-A421
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.
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
Is there a boardview for NM-A421?
No boardview has been indexed for NM-A421 yet; the schematic is available on this page.
Who designed the NM-A421 board?
NM-A421 is an LCFC board number used by Lenovo.
What BIOS chip size does NM-A421 use?
The BIOS images for NM-A421 are 16 MB.
Which laptops use the NM-A421 board?
Files in the catalog link NM-A421 to the Lenovo ThinkPad T460S.
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.