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  • ensure that it is connected to the correct port (worked with me) Commented Nov 23, 2017 at 18:58
  • Other thing to try, if you are using a different board try plugging in a genuine Uno or true clone, setting the board and port, uploading a sketch, then start over with your board. That has helped me. Seems that some boards don't reset the usb properly after a problem. ...or maybe it's just voodoo. Commented Dec 2, 2019 at 20:46