Hi there @FFenby, good to see you have joined the Fitbit Community! It seems your mobile phone has all the hardware requirements to be a supported device but is currently not on our list of supported devices. This means that we have not tested it for compatibility and added it to the list to guarantee all features will work as expected.
If your tracker has been syncing before the update, it would not hurt to try the following suggestions: Having trouble syncing? (here's how to fix this).
Hope this helps and stay tuned to the Fitbit Community if you have more questions.
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