EFI/boot ROM firmware for a MacBook Pro logic board, Apple number 820-2249-A, where the -A suffix marks the board revision. Apple prints this 820 number on the logic board, and it, not the model name, decides which ROM fits. The 1.28 MB ZIP holds an image for the SPI flash, used to fix boards that power on with no chime or picture due to corrupted firmware. Dump the original chip first with a programmer, since it holds the serial number and other unique data that may need moving into the new image.
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 @Laptopdesktopbios. Enginerys does not host this file.
All sources (2)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @Laptopdesktopbios | 20 Jul 2024 | Open file on RM Schematics |
| @laptopchiplevelrepair | 20 Jul 2024 | Open file on RM Schematics |
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →