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Fitbit Sense is not starting up

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Battery was completely drained and so, I charged it. Tried booting it up by pressing the power button on the side for 10 seconds as mentioned in the restart instructions. The watch vibrates and the Fitbit logo appears but the logo disappears again. Even with my thumb not on the power button, the watch vibrates, logo appears and goes off. This is continuously happening and the phone is not starting up.

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Following. Same thing happened to my Sense. Last time it synced was 3/13, and it also would vibrate as though it was responding to the button, but did not turn on

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