Sorry, I didn’t see your prior posts. Have you tried establishing a bluetooth connection while still connected by USB? I was able to do that! If that works you will be connected wirelessly even though you are technically wired. You can tell this has worked by looking at your wifi connection which will show a connection to mercedes
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I forgot to mention, after establishing a wired connection, go to your bluetooth settings to see if it finds the dongle and if it does tap on it to force the bluetooth connection