Welcome to the Forums @Lorisfitness.
Let me help you find the best way to move forward.
This might be happening because no Blackberry phone is part of the supported devices list. This means that the app has not been fully optimized to work with that phone.
As long as it fulfills the minimum requirements, Android 4.4 and Bluetooth 4.0, there is a possibility that it can work but we cannot guarantee it. Some users of unsupported devices have mentioned that following these steps helps with the syncing. Additionally, I'd recommend that you try to run the set up as if it was a brand new device. That should force the firmware update to be downloaded and installed to the Fitbit.
If none of the above works, you could try to use a computer or another mobile device to try and sync your Fitbit to your account. Click here to get instructions on how to sync with other devices.
Let me know if you have any further questions.
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