1. Unplug AC and remove main battery.
2. Remove the bottom cover.
3. Disconnect the silver coin-cell CMOS battery (CR2032).
4. Press and hold the power button for 30 seconds (drains capacitors).
5. Leave the laptop without any power source (no CMOS, no main battery, no AC) for 24 hours.
6. Reconnect the CMOS battery and main battery. Power on.

The 450 G2 belongs to HP’s "Business Class" series, meaning it uses a chipset-based lock (AMI BIOS) that generates dynamic passwords based on system board serial numbers and timestamps. hp probook 450 g2 bios administrator password top

If you have lost the password, HP's official policy for business PCs like the ProBook is that they cannot reset it for you remotely. For the HP ProBook 450 G2 Go to

Method 3: Software Extraction via Windows (If Already Booted)

If you accidentally inherited a locked laptop but the previous owner left Windows accessible (maybe the password is just for BIOS settings), you can extract the hash from Windows. Unplug AC and remove main battery