To better assist you, please confirm that you've tried the factory reset as follows: Press and hold the button for about 8 seconds until the screen turns off and vibrates. When you feel the vibration, release the button, then immediately press and hold the button again. Wait for the Fitbit logo to appear, then as soon as the logo disappears, release the button, then press and hold the button again. When you feel the vibration, release the button, then wait for the watch to complete the factory reset. It helped me, try it yourself
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