ConfigMgr
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Prereq checks
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecureBoot\State
has UEFISecureBootEnabled = 1
in WinPE
Apparently there's also HKLM\System\CurrentControlSet\Control PEFirmwareType
but you have to run wpeutil UpdateBootInfo
to populate it and that fails in PE for me.