PowerShell and WMI to modify BIOS settings

Question

Hello Scripting Guys!!
I am trying to change BIOS settings for HP DC8300 Desktop using PowerShell /WMI. By going though the HP Client Management Interface technical white paper from HP, which describes the class and method to accomplish this task, and research. I came to know about
the following command.
$AfterPower = gwmi -computername [PCName] -Namespace root/hp/instrumentedBIOS -Class HP_BIOSSettingInterface
$AfterPower.SetBIOSSetting ('After Power Loss', 'Off', 'password' )
The command runs successfully, however it displays the following output with the return code 6
__GENUS : 2
__CLASS : __PARAMETERS
__SUPERCLASS :
__DYNASTY : __PARAMETERS
__RELPATH :
__PROPERTY_COUNT : 1
__DERIVATION : {}
__SERVER :
__NAMESPACE :
__PATH :
Return : 6
The Return Code  6 is Access Denied
This happens even when I run this script targeting my local machine. I am runing the PoweShell as Administrator  also checked the WMIControl security setting  from "Services and Application"
under Computer Management Concole which is in order.
Any help would be highly appreciated.
Cheers!!!!
Faraz Amjad

Answer 1

Hi Guys,
After spending a complete day and going through different forums and HP's documentation (HP CMI technical whitepaper), I finally got this working by the following script. 
$AfterPowerr= Get-WmiObject -computername "PCNAME" -Namespace root/hp/instrumentedBIOS
-Class HP_BIOSSettingInterface 
$AfterPower.SetBIOSSetting('After Power', 'On ' , '<utf-16/> Password')
Password will be your current password and in plain text.
Sharing is Caring
Faraz Amjad