BIOS dump for the Apple A1502 logic board 820-3476 revision A, intended for a Macronix MX25L6406E flash chip, with the name marking it as a new image; it comes as a 3.86 MB RAR. The MX25L6406E is a 64 Mbit, 8 MB SPI chip, so the extracted file should be that size. Apple's 820-xxxx numbering must match your board. Write it with a programmer after reading and keeping the original, which holds the machine's serial and system data, then verify.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @biosarchive. Enginerys does not host this file.
All sources (4)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @biosarchive | 22 Apr 2018 | Open file on RM Schematics |
| @one5technology | 10 Nov 2020 | Open file on RM Schematics |
| @generalbios | 8 Oct 2023 | Open file on RM Schematics |
| @generalbios | 15 Dec 2024 | Open file on RM Schematics |
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →