Have a great day,
The NXP does not provide development kit for the QN9021. The QN9020DK is based on the QN9020 which has 48 pins, while the QN9021 has 32 pins. There is a difference between the GPIO for the QN9021 and the QN9020. But the QN9020DK also can be used for software development for the QN9021. The QN9020 has all GPIOs available on the QN9021.
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