Do you have access to the on the device, or are you completely locked out?

Q: What is the default BIOS password for HP EliteBook 850 G8? A: There is no default BIOS password for the HP EliteBook 850 G8.

If official channels are unavailable, specialized technical methods exist, though they require high technical skill and may void warranties: Hp EliteBook 840 G8 Bios Unlock Step by Step 100% Free

This is the intended method for IT departments managing fleets of laptops. HP provides a specific utility that runs in Windows (if you can still log into Windows) or via a bootable USB stick.

Disclaimer: Attempting to bypass a BIOS password on a machine that is not yours may violate security policies or laws. If you'd like, let me know: Does the error code start with "A" or "5CG"? Do you have access to a programmer tool? HP Elitebook 850 G8 Bios unlock - Badcaps

HP Consumer Notebook PCs - BIOS Setup Information and Menu Options Press f10 to enter BIOS Setup Utility. 3 Ways to Reset a BIOS Password - wikiHow