Disassemble the ZBook 15 G5 to expose the motherboard. Look for an 8-pin SPI Flash chip (often Winbond or MXIC brands).
This report outlines the status and procedures for resetting the BIOS administrator password on an as of 2021. Current Status & Policy (2021) hp zbook 15 g5 bios password reset 2021
In very early 2020 (and bleeding into early 2021 for unpatched units), security researchers found a flaw in the SMC controller. Technicians used a Linux bootable USB (a tool called smcutil ) to dump and clear the NVRAM region. Disassemble the ZBook 15 G5 to expose the motherboard
Example Command: BiosConfigUtility64.exe /NewAdminPassword:"" Current Status & Policy (2021) In very early
Turn on the laptop and press repeatedly to enter the BIOS. Type the password incorrectly three times. Press F7 when prompted for HP SpareKey Recovery .
You will need to take this code to a computer or smartphone with internet access. Several online communities and forums (such as the well-known BIOS Password Reference) provide free calculator utilities that generate an unlock master password based on your HP system code.