Boards 820-3023 1
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- MBA4,2 BIOS v0077 B12
Apple MacBook Air 4,2 boot ROM, version 0077 B12, for logic board 820-3023. Apple numbers its logic boards 820-xxxx, with a suffix letter for the revision.
BIOS · 820-3023 · 3.73 MB · 30 Jan 2019BIOS zip3.73 MB - k21 mlb 051-8870 3.13.0 PDF
Schematic PDF for Apple project K21, MLB drawing 051-8870 version 3.13.0, compressed in a 3.09 MB RAR.
Schematic · 3.09 MB · 5 Jul 2021Schematic rar—3.09 MB