If you have forgotten your password, standard tricks like removing the CMOS battery will not work on this modern business laptop. HP stores security certificates in non-volatile memory that does not require battery power to retain data.
Use dedicated community patching tools or manual hex manipulation to locate the locked security configuration blocks and replace them with FF (empty) values or clean factory code blocks. hp probook 440 g6 bios password reset exclusive
Turn on the laptop and press F10 to enter the BIOS setup. If you have forgotten your password, standard tricks