If you have made that change then most likely your system hardware does not support Firmware Protection or Hyper-V is not enabled, check the System Requirements on this link:
Firmware protection off and button grayed out
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Anonymous
I enabled firmware protection via Group Policy editor, but when I went to windows security the firmware protection button was off and grayed out with a message "This setting is managed by your administrator."
I want the fix and turn on Firmware protection
Windows for home | Windows 11 | Security and privacy
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Anonymous
2024-01-08T11:40:26+00:00 Sir I already did that but after a restart the firmware protection option disappeared
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DaveM121 933.9K Reputation points Independent Advisor2024-01-08T11:38:13+00:00 Go back into your Registry editor, it sill still be on the same page
Click System Guard on the left.
Right click the 'Managed' key in the right pane and delete it.
Restart your PC to apply that change.
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Anonymous
2024-01-08T11:27:48+00:00 Sir here is it
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DaveM121 933.9K Reputation points Independent Advisor
2024-01-08T11:22:53+00:00 Okay, we need to check another location in your registry.
Click View and make sure 'Address Bar' is turned on.
Paste this into the Address Bar at the top and hit Enter.
KEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios
Expand the Scenarios key (folder) in the left pane
Please provide a screenshot of that Registry Editor page.