Apple firmware dump for logic board 820-2530, revision A, stored as a 4.00 MB raw binary. Apple marks its logic boards with 820-xxxx numbers, and the trailing letter denotes the board revision. The image size suits a 32 Mbit SPI flash, which technicians program with an external programmer to revive a board that will not chime or boot due to corrupted firmware. Read and archive the original chip first, because it holds the unit serial and system data, and confirm the board number on the PCB before writing.
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 @bioshub. Enginerys does not host this file.
How to open a .bin file
A raw, byte-for-byte image of a flash chip: the main BIOS / UEFI, the embedded-controller (EC) firmware, or both.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →