Apple A1989 820-00850 BIOS (4 MB)
File details
| Type | BIOS |
|---|---|
| Brand | Apple |
| Model | A1989 |
| Board number | 820-00850 |
| Board maker (ODM) | Apple |
| Device | Laptop |
| Format | RAR |
| Size | 2.2 MB |
| BIOS chip size | 4 MB |
| Added | November 4, 2025 |
| Updated | |
| Original file name | MAC A1989_820-00850-A 4MB BIOS.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
MAC A1989_820-00850-A 4MB BIOS BIOS dump for the Apple A1989 laptop, board number 820-00850, supplied as a RAR archive of about 2.2 MB and designed for a 4 MB flash chip. Technicians use a dump like this to reprogram the SPI chip with a programmer after a corrupted firmware image or a failed update. Confirm that the board number and revision on your logic board match the file name before flashing, and read out and save the original chip contents first so you can restore them if something goes wrong.
The catalog also lists 3 schematics, 1 boardview file, and 3 BIOS dumps for board 820-00850.
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 A1989 820-00850. 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.