The BIOS password on this model is stored in non-volatile memory (EEPROM) that does not clear when the CMOS battery is removed.
Reconnect the RTC battery, snap the bottom cover back into place, and power on the system.
If you still have administrative access to the Windows operating system on the ZBook, you might be able to clear or change BIOS settings using HP’s official enterprise deployment tools. This requires the Windows user account to have full local Administrator rights. Step-by-Step BCU Method: hp zbook 15 g5 bios password reset 2021
If support cannot provide an unlock file, HP's standard solution is a system board replacement, which may incur costs if the device is out of warranty. 2. "System Disabled" Code Method
3. Method 2: Resetting via HP BIOS Configuration Utility (BCU) The BIOS password on this model is stored
For out-of-warranty or locked devices where HP cannot/will not provide SMC.bin, hardware methods were the only recourse in 2021.
By following these methods, you should be able to reset the BIOS password on your HP ZBook 15 G5 laptop in 2021. This requires the Windows user account to have
There is one legitimate software-based method for BIOS User Password (not Administrator). If you can boot to Windows (e.g., password only appears for entering BIOS, not for booting):