Hello @bonbon1, welcome aboard to the Fitbit Community! This phone doesn't figure in our list of compatible devices which means we haven’t yet tested it. Since the app is not optimized to work with this device is possible the app doesn't work as is expected.
If the issue persists, please refer to the following post: Having trouble syncing? (here's how to fix this).
If you have questions about the warranty of your tracker, please review the following: Return Policy and Warranty.
See you later and hope this helps.
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