I just burned my backup to a DVD-R DL Verbatim disc (4x) with ImgBurn. I'm getting an #001 Unauthorized Device detection error. I still have my DVD+R DL USA version of SSBB and that one is working without any errors.
Wiikey 1.9s and Wii 3.2E here. Could it be that a DVD-R DL causes this error...