Apple MacBook Air A1466 820-3209 BIOS
File details
| Type | BIOS |
|---|---|
| Brand | Apple |
| Model | MacBook Air A1466 |
| Board number | 820-3209 |
| Board maker (ODM) | Apple |
| Device | Laptop |
| Format | RAR |
| Size | 7.6 MB |
| BIOS chip size | 8 MB |
| Marks | tested by uploader |
| Added | November 4, 2025 |
| Updated | |
| Original file name | Apple_MacBook_Air_A1466_EMC_2559_820_3209_A_8MB_BIOS_TESTED_OKOK.rar |
Where to get the file
Opens the matching file on RM Schematics, or its source details if it is not catalogued there yet.
Alternative links
No other copies are known yet.
Description
Apple MacBook Air A1466 EMC 2559 820 3209 A 8MB BIOS TESTED BIOS dump for the Apple MacBook Air A1466, board number 820-3209, with an 8 MB flash chip. The uploader marks it as tested, though that is their own claim and not something we have checked. Technicians use a BIOS dump like this to reprogram the SPI flash with a programmer after firmware corruption or a failed update. Before writing anything, confirm that the board number and revision on your logic board match 820-3209, and save a backup of the original chip contents. The archive is RAR and about 7.6 MB.
For board 820-3209 the catalog also has 1 schematic, 1 boardview file, and 1 BIOS dump.
Description generated from the catalog data. ·
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Questions about this file
How do I flash this BIOS dump?
Write it to the SPI flash chip with a programmer such as the CH341A and a SOIC8 clip. Read and keep the original contents first, and check that the chip size matches the dump.
Will this BIOS work on my board?
Only if the board number and revision match: Apple MacBook Air A1466 820-3209. Dumps from a different board or revision can leave the board dead.
What does “clean ME” mean?
The Intel ME region in the dump has been reset, so it can be used on another board of the same model. Keep your original dump and transfer serial numbers if needed.