BM5406 – Lenovo S20-30
The BM5406 (Bitland) motherboard is found in the Lenovo S20-30. 4 files are indexed for this board: 3 BIOS files, 1 schematic and 1 EC firmware image.
File names mention revision 1.3 or 1.0. The earliest file dates from April 2021 (BIOS Archive, Schematics & Boardviews Archive and Cyberlan Electronics).
BIOS dumps 3
Schematics 1
Board facts
| Board number | BM5406 |
|---|---|
| Designed by | Bitland |
| Revisions | 1.3, 1.0 |
| First seen | 2021-04-25 |
| Source channels | BIOS Archive, Schematics & Boardviews Archive, Cyberlan Electronics, BIOS Skema Boardview Laptop |
| About the number | Bitland boards for Lenovo IdeaPad models are named BM followed by four digits. |
Laptops that use BM5406
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 |
| .bin | BIOS image inside the archive (usually .bin) | a CH341A, XGecu T48 / TL866II Plus or RT809H programmer |
Questions
Who designed the BM5406 board?
BM5406 is a Bitland board number used by Lenovo.
Is there a boardview for BM5406?
No boardview has been indexed for BM5406 yet; the schematic is available on this page.
Which laptops use the BM5406 board?
Files in the catalog link BM5406 to the Lenovo S20-30.
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.