App won't sync

[Hessa]

I have a Samsung Galaxy S5 and a fitbit flex. It won't sync. I deleted the app and still no luck. Help!

[MaginB]

Hey there @Hessa! Welcome to the Community! 

Let me help you out, I recommend performing the troubleshooting steps below:

1. Close the Fitbit app and open it again. A sync should occur whenever the app is opened.
2. Turn off Bluetooth, turn it back on, and then open the Fitbit app.
3. Reboot your mobile device and then open the Fitbit app again.
4. Perform the restart  2 or 3 times in a row and make sure to follow the instructions that @SunsetRunner. 
5. Uninstall and reinstall the Fitbit app.
6. Consider using the All-Day Sync setting. This prompts your tracker to periodically sync with the Fitbit app but may cause increased battery drain on your mobile device or tracker.
7. Try syncing with a computer instead but if you have notifications enabled first read Why is my tracker only syncing with one mobile device?
8. If you're still unable to sync, contact Customer Support so we can investigate the issue and get you back on track.

Hope it helps!