The HP ZBook 15 G5 is a robust mobile workstation, but like many business-class laptops, it includes stringent security features. If you are locked out of the BIOS with a forgotten password, the situation can be frustrating. While there are many "free" solutions advertised online, the reality for this specific model (released in 2018) is more complex than older laptops.
CMOS Battery: Removing the small coin battery will not clear the password on a G5. It only resets the system clock and basic hardware settings. hp zbook 15 g5 bios password reset free
What is a BIOS password and why is it important? HP ZBook 15 G5 BIOS Password Reset: A