Given you have maybe a few million lines of code you know works from existing platforms, and you need some new functions for a new model added to it, and lots of man hours invested, where do you think the car manufacturers are going to go? Tesla had to develop everything from scratch, and with their business model, they had little choice.
I have confidence that most cars will eventually go to that OTA update, but I'm not surprised BMW hasn't done it yet.
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