My Charge HR will not synchronise and when it does, data previously synchronised disappears a day later so I have a history showing multiple days with zero activity. This, despite checking that the Bluetooth is working and my device is close to my iPhone 4. Anyone else experiencing this?
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@fingersphil Unfortunately the iPhone 4 isn't compatible with syncing Fitbit trackers since it doesn't have the required Bluetooth 4.0 LE.
Click here more information on which devices are compatible with syncing Fitbit trackers.
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