4 MB BIOS image for the HP ProBook 6550b, the second of possibly several copies according to the trailing number. The working status is not stated. It is intended to be written to the board's SPI flash with an external programmer when the laptop fails to POST because of corrupted firmware. Keep a backup of the existing chip, since it stores serial and product data. Check that the chip capacity matches the 4 MB size before writing.
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 →