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I don't believe that you need a newer PRO head unit. I have a 2006 car and I updated the URAD2 firmware with WinKFP yesterday to add Phone and SMS and USB using a 2009 Mulf2 High and that worked. Most probably a new firmware is all that is required. My radio software went from 65.0.3 in INPA to 93.73.2, I'm hoping software is enough. It's not as though the newer radios have their own speaker, it just runs off of the stereo so why wouldn't it work?
I will change the coding on the cluster as outlined above and test.
Will report back.
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