820-2577 – Apple A1347
820-2577 is the Apple main board used in the Apple A1347. ChambersDesignInc.com has indexed 3 files for this board — 3 BIOS files.
File names mention revision A. The BIOS dumps are 4 MB images. First posted in April 2021 in BIOS Archive.
BIOS dumps 3
Board facts
| Board number | 820-2577 |
|---|---|
| Numbering | Apple board number |
| Revisions | A |
| BIOS chip size | 4 MB |
| First seen | 2021-04-25 |
| Source channels | BIOS Archive |
| 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 |
|---|---|---|
| A1347 | Mac mini | 2010–2014 |
A-numbers come from the file names; the model names and years are Apple's published identifiers.
Laptops that use 820-2577
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 |
Questions
What BIOS chip size does 820-2577 use?
The BIOS images for 820-2577 are 4 MB.
Which laptops use the 820-2577 board?
Files in the catalog link 820-2577 to the Apple A1347.
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.