Learn how to select the processor for the Arduino Nano in the Arduino IDE.
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Make sure you have Arduino AVR Boards core 1.16.21 or later installed in the Boards Manager, and that you've selected
Arduino NanoinTools > Board > Arduino AVR Boards. -
Open the processor selection menu in
Tools > Processor.-
If your Nano was purchased 2018 or later, select
ATmega328P. -
If your Nano was purchased 2017 or earlier, select
ATmega328P (Old Bootloader).
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If you're unsure which version you have, you can try both to see which works.
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