The Y cable from BMW is designed to transport video, the only ones on amazon are the pre lci (TCU) 6fl cable. The TCU was never designed for video handling so that's why that cable doesn't send video. As far as the white cable, yea white cable works for anything non plugin featured. If you retrofitted 6NR like myself and bypassed the need for the cradle then your only way to use plugin is with the 6NR cable from BMW only problem is its Iphone 4 connector and not the 5. The beginning of the thread talks about what everything supports.
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