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How to undo a permission setting in the Registry

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Last Modified: 2020-12-23
Hi all!

I have Windows 10 Pro with BitLocker +PIN enabled in a workgroup.

I denied SYSTEM & Administrators Full Control permissions from the HKLM\SYSTEM\CurrentControlSet\Control\Lsa key. Does that interfere with or affect SecureBoot and/or BitLocker +PIN in any way? Because I can't access the drive since I denied it write abilities. The BitLocker PIN prompt pulls up on boot, once I type it in it goes into BIOS where it loops back to BitLocker PIN Prompt.

I didn't create a backup of the registry of course. 

Is there a way of getting those permissions back (I'd assume not because there is no higher elevated account to grant access from)?

Thanks!
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