Firmware image for the Apple iMac 27 inch Late 2013, logic board 820-3481-A, where A is the revision suffix in Apple 820 numbering. The 8 MB binary corresponds to a full SPI flash dump containing the EFI firmware. Technicians write it with an external programmer when the iMac fails to boot or shows firmware corruption. Confirm the board number printed on the logic board, read and save the original chip contents first, and transfer the serial number and system data into the image if required.
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 @abgm_manutencao_bios. 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 →