Theory: Removing the CMOS battery clears volatile settings.
Practice on ZBook 15 G5:
Success Rate: Low (only works if the password is "user" level and admin rights are available). But try it—it costs nothing and takes 5 minutes.
If the above steps do not work, the "free" options have been exhausted. The ZBook 15 G5 is designed so that the BIOS password cannot be bypassed by simple hardware tricks to prevent theft.
The Official Solution: