HP ProBook 450 G9 BIOS image labelled unlocked, contained in a 13.1 MB rar archive. It is meant for removing a BIOS administrator lock by rewriting the flash chip, but the name gives no board number, revision or firmware version. Technicians flash it with an external SPI programmer after removing power and battery. Verify the motherboard code printed on the PCB, save a full backup of the original chip, and check that the image matches the capacity of the installed flash part 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 .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 →