Learn the steps needed to reboot or factory reset your tracker

Your Fitbit may act reliably most of the time, but it’s always handy to know how to reset it just in case.

Whether you have a Charge 3, Versa 2, Inspire HR or Ionic, if your Fitbit is failing to respond, won’t track you or won’t sync, it’s likely you’ll have to give it a restart.
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https://www.wareable.com/fitbit/how-to-reset-fitbit-6808