Unplug the primary battery cable from the motherboard to stop all current flow.
If you needed to unlock a ZBook 15 G5 in 2021, you had exactly three options. They range from free (but impossible) to expensive. hp zbook 15 g5 bios password reset 2021
Locate the small coin-cell RTC (Real-Time Clock) battery and unplug its cable. Unplug the primary battery cable from the motherboard
If you were locked out of an HP ZBook 15 G5 in 2021, you had two choices: use specialized software
Removing the internal battery or the CMOS battery will only reset the date, time, and system settings—the password will remain secure. To reset the password, you must either trigger a specific cryptographic challenge-response protocol, use specialized software, or physically clear/flash the BIOS chip. Method 1: The 3-Incorrect Password Method (System Disabled)