Flex not syncing with app.

[Kdayhuff]

I have a Fitbit flex that I’ve had for about three years. The Fitbit itself is still working but it won’t syncs to my Fitbit app anymore. I’ve tried deleting the app and adding it again, turning my phone on and off, getting rid of the device on the app and adding a new one, but nothing is working.

Moderator Edit: Clarified Subject.

[MarcoGFitbit]

Hello @Kdayhuff, have a warm welcome to the Fitbit Community, it's great to have you on board. 

I appreciate your participation in the Forums and for letting us know the troubleshooting steps you've tried so far in hopes to resolve this situation. At this moment, I would like to suggest you to try to set up your Flex again following these steps in order:

1. Go to the Bluetooth settings on your phone and check if your tracker is on the list of paired devices. If it is, tap on it and select Forget this Device.
2. Turn off Bluetooth on your phone; wait 10 seconds, and then turn it back on.
3. Make sure you have a strong WiFi signal and that there are no other Bluetooth devices around that might interfere with the setup process.
4. Restart your Flex, then leave the tracker plugged in and charging.
5. If you can't set up after a restart, reboot your phone or tablet and try to set up again.
6. If you can't set up after the reboot, remove all other Fitbit devices from your account and from the list of connected Bluetooth devices on your phone or tablet and try to set up the Versa one more time. 

I hope this can be helfpul, give it a try and let us know the outcome.