Apple firmware image labelled for model A1534 with EMC number 3099, supplied as an 8.00 MB raw binary. No logic board number appears in the name, so identify the board from the PCB silkscreen before use. A dump like this is written to the SPI flash chip holding the Mac EFI firmware using a programmer such as a CH341A or RT809H. Read and save the original chip contents first, confirm the chip capacity matches the 8 MB image, and expect serial number and hardware data to need transferring from the original dump.
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 @efibios. 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 →