Two-byte status register sidecar belonging to an HP EliteBook 820 G1 BIOS read, where 128 most likely refers to a 128 Mbit flash chip. It holds no firmware, only the value of the flash status register with its protection and configuration bits. Programmer software creates such files so the register state can be checked or restored after the main image is written. Use it together with the companion 16 MB image, and clear the block-protect bits first if the chip will not accept an erase.
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.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →