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    Do you have a capacitor on the RESET pin of the Arduino? From you image I'm not sure. You need it for preventing the Arduino to reset and start the bootloader, when the serial port is opened Commented Apr 15, 2019 at 14:48
  • I tried to put 10uF and 22nF capacitors there. With 10uF, I get a bunch of avrdude: stk500_getsync() attempt 10 of 10: not in sync errors, the 22nF cap has no effect. Commented Apr 15, 2019 at 14:52
  • @Juraj I don't understand. Are you saying the tutorial I am following is wrong? When I select "Burn bootloader" it finishes without errors, but I don't know if it actually does anythinh. Commented Apr 15, 2019 at 15:02
  • 2
    sorry. Use the "Upload using programmer" in Sketch menu to upload a sketch over ISP Commented Apr 15, 2019 at 15:10
  • 1
    @Juraj Awesome, it works fine. The older versions of Arduino IDE used the same button to upload using ISP. It kinda made sense in my opinion. After all, I already selected Arduino as ISP. Commented Apr 15, 2019 at 15:13