820-3462 – Apple A1425
820-3462 is the Apple main board used in the Apple A1425. The catalog lists 2 files for it: 1 BIOS file and 1 boardview.
Revisions seen in file names: A. The earliest file dates from April 2018 (BIOS Archive, Schematics & Boardviews Archive and Cyberlan Electronics).
BIOS dumps 1
Boardviews 1
Board facts
| Board number | 820-3462 |
|---|---|
| Numbering | Apple board number |
| Revisions | A |
| First seen | 2018-04-17 |
| Source channels | BIOS Archive, Schematics & Boardviews Archive, Cyberlan Electronics |
| About the number | Apple logic boards are numbered 820-xxxx or 820-xxxxx; the trailing letter is the revision. |
Apple models for this logic board
| A-number | Model | Years |
|---|---|---|
| A1425 | MacBook Pro 13-inch Retina | 2012–2013 |
A-numbers come from the file names; the model names and years are Apple's published identifiers.
Laptops that use 820-3462
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 boardview is the component placement map of the PCB: click a part or a net and the viewer highlights where it is and what it connects to. Used together with the schematic to find test points.
Tools to open these files
| Format | What it is | Open with |
|---|---|---|
| .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
Which laptops use the 820-3462 board?
Files in the catalog link 820-3462 to the Apple A1425.
Is there a boardview for 820-3462?
Yes, 1 boardview file.
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.