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#11
The permission you need is 1 higher, SYSTEM.
Above admin permission there is the SYSTEM permission, this permission level is used by Windows to protect files in the Windows folder, preventing critical files from being altered. One can't get that permission level.
While you are in Windows, there is no way to alter any files protected by the system.
You need a WinPE to work around the permission issue, see Windows 10 Recovery Tools - Bootable Rescue Disk - Windows 10 Forums