BIOS dump for a Microsoft Surface Book, with the name stating L2 and part number M1031783-004 and a 16 MB image size, packed in an 8.44 MB RAR. The 16 MB size corresponds to a 128 Mbit SPI flash chip. Such dumps are written with an external programmer to revive a board with corrupted firmware. Verify the board part number and chip capacity first, read the original chip twice and compare checksums, and note that device-specific data such as serials may be lost when writing another board's image.
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 →