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  • Did you try to close arduino IDE and then reopen it? Did you try to unplug the USB-to-TTL converter and plug it again? Did you try close Arduino - unplug - plug again - open Arduino IDE? Commented Jun 6, 2017 at 9:38
  • @frarugi87 Yes, of course. I've figured out how to fix this and much more, answer coming soon ;) Commented Jun 7, 2017 at 6:55
  • i see this question a lot, so it would be helpful if you could post an answer... Commented Jun 8, 2017 at 6:25
  • @dandavis I posted it that day but for some reason it didn't appear. It should be ok now. Commented Jun 8, 2017 at 18:53