Apple firmware dump with an uninformative name; wd and gbm give no definite model, board number or revision. The 2 MB binary suggests an EFI or other flash image from an older Mac logic board, but the target must be confirmed before use. Open it in a hex editor to look for board identifiers or a firmware version string, and compare them with the 820 number on the logic board. Always read and save the original chip before writing, since Mac firmware also holds serial and system-specific 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 @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 →