I've been using just the following 2 keys to unlock and unhide. YMMV :=)
HKEY_LOCAL_MACHINE\System\StorageManager\AutoLoad\ TRUEFFS_DOC1
"Bootphase"=dword:00000002
HKEY_LOCAL_MACHINE\System\StorageManager\Profiles\ TRUEFFS_DOC1
"MountHidden"=dword:00000000
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