Apple MacBook A1181 EFI firmware for logic board 820-2496-A, supplied as a RAR archive of roughly 1.28 MB. A1181 is the model number of the white and black polycarbonate MacBook, and 820-2496 is the board identifier printed near the edge of the PCB. The image is meant for the boot ROM and is normally written with an external programmer when the machine fails to start after a corrupted update. Before flashing, read out the existing chip and keep that copy, verify the board revision letter, and make sure the dump size suits the installed flash part.
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 (10)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @biosarchive | 14 Jun 2020 | Open file on RM Schematics |
| @laptexlaptopbios | 28 Jun 2020 | Open file on RM Schematics |
| @laptexlaptopbios | 6 Jul 2020 | Open file on RM Schematics |
| @one5technology | 21 Nov 2020 | Open file on RM Schematics |
| @pepeelectronica | 21 Apr 2022 | Open file on RM Schematics |
| @pepeelectronica | 24 Apr 2022 | Open file on RM Schematics |
| @skclappybios | 10 Apr 2024 | Open file on RM Schematics |
| @schematics_bios | 24 Jul 2026 | Open file on RM Schematics |
| @schematics_bios | 24 Jul 2026 | Open file on RM Schematics |
| @schematics_bios | 1 Aug 2026 | 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 →