Remind that the Processor option is only available when you select some specific Boards at Tools>Board. Sorry :(Ĭhange Tools->Processor->Atmega 328P to Atmega 328P (Old Bootloader). Replace the microcontroller if you have another one handy nearby.Make sure the microcontroller is seated correctly.Double-check all board-related issues in the "easy fixes" list above.Double-check all computer-related issues in the "easy fixes" list above.If none of those work, you will want to try to isolate the issue by replacing things: try a different computer on the same arduino, try a different arduino on the same computer, and try using a different USB cable. Make sure digital pins 0 and 1 do not have any parts connected, including any shields.Go back to Tools ► Serial Port ►, and see which port appeared that wasn't there before.
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