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I'd bet on a defective USB cable. I have always had problems with the USB cables provided with Onyx or Boyue devices, so I have bought a couple of good-quality ones elsewhere. They have worked flawlessly.
As for the rest, there is a learning curve involved with any Android E-Ink device. More so than with other Android tablets or phones. Manuals are of limited help. Only you can decide if the investment of time is worth it for you. It has been worth it for me.
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