• That's an odd one - it usually happens when the firmware that's been uploaded isn't working. What was the firmware file you uploaded called?

    And just to check, if you look on the PCB right by where you put the battery in, what version is your Puck?

    Just tried here on a Puck and it seems ok, so it might be worth re-uploading firmware just in case. Also, try applying the battery while holding the button for ~20 seconds, and see if that makes any difference?


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