Following up on this thread as I have seen responses but never if the solutions have worked.
Issue:
2016 Supra - Bought in 2020 - Would not allow us to delete existing Bluetooth phones or pair ours and then suddenly all worked fine for the rest of summer 2020.
Had the boat winterized 10-20. Just put her back on the water today and there is a phone we have never seen that is "paired". We cannot delete any phones or add other phones (we all got iPhone12s in Jan so need to delete all anyway). Tried turning off the boat, turning off the battery, etc. No matter what phone we try to delete it says its the same Phone "M's iPhone" and it never deletes regardless. Final attempt we got the Media Connection error message over and over as well as the inability to delete or connect new BT phones.

The USB has never worked so the is not an option. Please help as a boat on the water without music is not good!