Firmware archive labelled only with the Apple model number A1278, the 13-inch unibody MacBook Pro family. The name gives no logic board number, revision or year, and A1278 covered several generations with different boards, so the contents must be checked against the 820-xxxx number printed on the PCB. The ZIP is 5.59 MB and likely contains an EFI image for SPI programming. Read and save the existing chip before writing anything, and verify the dump size equals the flash capacity, otherwise it will not fit.
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.
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 →