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  • Cool. I am willing to sacrifice one. I will try to order them this week. So, if I understand correctly, if the SWD pins are available, we can reprogram it right. My main interest is the heart rate sensor and getting raw values. The link I shared in the OP has HX3605 (I hope it has the drivers), I am not sure about the optical sensor in the second link. I will search for devices with HX3605 and try to place order.

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