820-2542
820-2542 is an Apple main board number. The catalog lists 2 files for it: 2 BIOS files.
Revisions seen in file names: A. BIOS images are 4 MB. The earliest file dates from November 2024 (BIOS Archive).
BIOS dumps 2
FileSizeRevAddedSource
Board facts
| Board number | 820-2542 |
|---|---|
| Numbering | Apple board number |
| Revisions | A |
| BIOS chip size | 4 MB |
| First seen | 2024-11-17 |
| Source channels | BIOS Archive |
| About the number | Apple logic boards are numbered 820-xxxx or 820-xxxxx; the trailing letter is the revision. |
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 |
| .bin | BIOS image inside the archive (usually .bin) | a CH341A, XGecu T48 / TL866II Plus or RT809H programmer |
Questions
What BIOS chip size does 820-2542 use?
The BIOS images for 820-2542 are 4 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.