Is the device you are trying to sync to a supported device?
iOS: https://www.fitbit.com/content/assets/onezip/images/devices/Fitbit_SupportedDevices_iOS.pdf
Android: https://www.fitbit.com/content/assets/onezip/images/devices/Fitbit_SupportedDevices_Android.pdf
Windows: https://www.fitbit.com/content/assets/onezip/images/devices/Fitbit_SupportedDevices_Windows.pdf
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