The BLE SENSE, BLE, and 33IOT have TWO COM ports. The second COM port also often referred to as "BOOTLOADER" can be invoked by quickly double tapping the reset button. It can also be used to help clear out a sketch that does not behave. For that simply put it into BOOTLOADER mode then upload eithe…

New to the NANO 33 BLE, SENSE, IOT please read this first

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