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The issue is with the permissions on the serial device. One command in the terminal resolved it for me though I have to run it each time I plug the device in.
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Thanks for the tips. Mine is on the way. Interested to see if anyone else nearby has one.
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Aha! I will give it a try before soiling my radio with an Apple product.
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Yep. I have been down this road before. I will be using my daughter's mac. I had the same issue with linux when trying to load Graphene on my pixel.