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  • Did you install the CH340G drivers? Commented May 5, 2017 at 19:48
  • I can't because the COM doesn't appear on Device Manager. Commented May 5, 2017 at 19:56
  • Not even in Unknown Devices ? Commented May 5, 2017 at 20:15
  • No. It doesn't appear at all. Commented May 5, 2017 at 20:18
  • Sounds like you most likely killed it. Maybe show how you wired the LED up with a photograph of it on your breadboard. Commented May 5, 2017 at 20:28