I am unlocking Password on HP Elitebook 640 G3- It goes very nicely but sometimes it gets wrong during rewriting. In this case I do not have the dump file to unlock again. Now I have only the Mainboard number. No BIOS seralnumber is in hand. How to finde or Create a new Bios file for this Mainboard. I have only the Mainboard number nothing else. Thank you.I92YA2