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Error: avrdude: stk500_getsync() in Nano boards

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This error can occur in either one of the following cases:

  1. If your Arduino NANO was purchased earlier than 2018 you have the older official version of Nano. In this case Select Tools > Processor > ATmega328P and select: (Old Bootloader) and try to compile your sketch again. It is also recommended to update Arduino AVR Core 1.16.21 or later through Boards Manager.
  2. If you have the newer version of the Nano board (manufactured in 2018 or later), make sure you have Arduino AVR Boards 1.6.21 or newer installed. Check this in Arduino IDE: Tools > Board > Boards Manager and select Tools > Processor > ATmega328P.

If you get an error while uploading or you are not sure which bootloader you have, try each type of processor 328P until your board gets properly programmed.

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