In order to upload to an Arduino board via a serial port, the upload tool (e.g., AVRDUDE) must be able to open the port. This is not possible if another process already has control of the port.
UPDATE: Works if you install latest MiniCore v3 from Board manager, problem only appears with "Manual installation". Hello. I have Arduino IDE 2.3.3 (cli version 1.0.4), recently downloaded from ...
[psgarcha] took a year-old Arduino Uno on an international trip and upon returning found something was wrong. Every time he would try to upload, he would get the dreaded avrdude error, ‘stk500_getsync ...
Arduino is so much about what is made with Arduino boards that we hardly spare a thought for the boards themselves. Well, Arduino cares, and they've just gone about redesigning their base model, now ...
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