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I think the main problem with this device is poor hardware QC. Chipsets etc may have changed across development, and/or several batches may have been less than optimal. Ideally the same firmware would behave identically on all units on a fresh install/new device, yet that's never been the case with people experiencing a myriad of different problems and difficulties; some can't even use the same firmware as others without their device becoming flawed beyond belief. I think people are mostly using 15.1 or 15.2, with some experimenting with the newer beta releases with a range of success.
With respect to hardware QC, Apple they ain't.
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