BIOS, meaning the EFI boot ROM, for an Apple MacBook Pro with logic board 820-2337-A, packed as a RAR. Apple's 820- number identifies the specific board, so check it against the PCB before flashing. Technicians write such an image to the SPI chip with an external programmer when a Mac powers on but will not boot or shows a firmware lock. Read the original chip first and keep the copy, because it holds the board serial and other unique data. The image size must match the chip's capacity.
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 @biosarchive. 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 →