Disassemable laptop (could you make it any more difficult to access the battery!!) and remove BIOS battery to try to clear settings.Attempt BIOS recovery in crisis mode by using USB drive with BIOS installed and using "windows-B" to initiate BIOS recovery.Remove power and battery - press and hold power button to clear power.Went through the various troubleshooting of: After about 15 secs the fan on the CPU comes on full power.No beeps or no diagnostic LED on CAPs lock key.No display on screen at any point or on VGA output."Wifi" button is oranage and "Mute" button is white.All seemed ok, until this morning when they turned on their laptops and all 3 ProBook 450 G3's were bricked. So I ran it on my group of "Targeted production users" yesterday. Simply ignored settings with a warning in the log as expected. I tested on a couple of machines in the lab and it worked without a hitch. If a particular system does not support the specified setting, it will be ignored." I didnt worry about a specific setting not being supported on a particular model.
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I wished to create one master config file that would cover all the models but since the manual states "By creating a configuration text file with only the setting you want to change, you can deploy it to all systems in the enterprise. I noticed some have different settings which is to be expected as new features are introduced etc. I created a settings file from backing up existing models (mainly ProBook 450 G0 though to G5) and comparing the settings. So I am testing using HP's BCU tool to standardise settings across all our HP machines (170 so need to make use of client management tools) and everything was going ok.