I opened the HP Software Assistant. It said I should update the BIOS, so I did it. The installer opened, installed and prompted me to restart. I did so. Upon restarting I got the HP logo that normally shows up when booting but below it is a keyboard (see attached picture). It briefly shows something like "System Update in progress" before opening the keyboard.
Can anyone please help? Or at least tell me which Password it wants. All known to me won't work.