Firmware archive for the Microsoft Surface Pro 2, and the name also carries the identifier X877434. It is packed as a RAR of roughly 2.95 MB, so unpack it and check which image files it holds before programming anything. Repair technicians use such dumps to restore a damaged SPI flash with an external programmer when the tablet stays dead or loops at power-on. Because Surface hardware is tightly integrated, back up the original chip contents before writing. Also verify that the dump size matches the capacity of the flash chip on the board.
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 →