We removed the main battery, the CMOS battery (CR2032), held the power button for 60 seconds to drain residual power, and waited 24 hours. Upon reassembly: The BIOS password was still there.
Before attempting to reset the BIOS password on your HP ProBook 440 G6 laptop, make sure to: hp probook 440 g6 bios password reset
Assume user sees this screen on boot:
HP ProBook 440 G6 BIOS Password Reset Guide Locked out of your HP ProBook 440 G6 BIOS? Whether you’ve forgotten the administrator password or purchased a used device with security locks, regaining access is essential for changing boot orders or updating firmware. We removed the main battery, the CMOS battery