If the built-in feature doesn't work, you can try resetting the BIOS password using a jumper. This method requires some technical expertise, so proceed with caution:
According to HP Support , if the BIOS administrator password is lost, the only official solution is to replace the system board (motherboard) at the owner's expense. Recovery Methods (If Pre-Configured) hp elitebook 850 g8 bios password reset upd
If the above methods do not work:
: If you have access but need to update, download the latest firmware from the HP Software and Driver Downloads page and use a USB flash drive to install it via the F2 Hardware Diagnostics menu. If the built-in feature doesn't work, you can