I have had a problem where the IDE (version 1.8.5) won't upload to Nanos. Only had this problem since updating the IDE and have not found a solution to it. As a workaround, I have been using xLoader. This is how I have done it, so should be the same or very similar for others on a Windows machine.…

Arduino IDE won't upload to Nano - xLoader will - possible workaround

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