Why is my Fitbit Flex not syncing?
If you use more than one phone or tablet device to sync, make sure the other device isn’t nearby. If the device is nearby, turn off Bluetooth on it. Turn off other Bluetooth connections when not in use. Your phone doesn’t have a syncing issue listed in What should I know about using the Fitbit app on my Android phone?
How do I reset an old Fitbit?
Press and hold the button or buttons on your tracker for 5 seconds. Release the button. When you see a smile icon and the tracker vibrates, the tracker restarted.
Does fitbit have a reset button?
To restart, press the button (located on the end of the charging cable) on the charging cable three times within eight seconds, briefly pausing between presses. 4. Then, eight seconds after the first button press, the Fitbit logo appears on the Ace’s display, indicating it has been restarted.