Second 16 MB read of the 440 G4 BIOS chip, probably taken to verify the first read matched, which is standard practice when dumping SPI flash. Comparing both copies with a hex compare tool confirms a clean, stable read before anything is written back. The image fits a 128 Mbit chip and includes the full flash layout. As with any dump taken from a specific laptop, it may hold that unit's serial and system data. Save your own original before programming a board with it.
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 @biosfilebins. 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 →