Firmware archive for Apple A1278, the 13-inch MacBook Pro, marked 2012 and labelled as an OK working BIOS, in a 4.01 MB RAR. Mac boards store EFI firmware on an SPI flash chip that can be reprogrammed with an external programmer to clear a corrupted image or firmware lock issues. Several A1278 board numbers exist across years, so match the logic board number on the PCB before writing. Always dump and keep the original chip contents, since they contain the unique serial and hardware data.
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 @fixtronix. Enginerys does not host this file.
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 →