I buy it from Aliexpress that was the cheapest way. Main reason was the BMW carnav soft is terrible. Ik bought the lastest map update 2021-1, but it has errors. One way streets in cities are not known, it directs you always to closed streets. Now I can choose between the BMW or Andream and Tomtom NDS on display. iDrive and buttons on the steering wheel are still working.
I'm now driving with Sygic open beta for Android Auto. Tomtom Navigation for AA is beta, but it is closed. I was too late to join
My 1st goal Tomtom NDS mirorring on the carscreen gives less quality picture.
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