Fairly easy switch.
First do a sync from old tracker to get all data from tracker to fitbit database.
Then from phone app tracker page, click the trash can at top right. I think it will give you a warning if you really want to remove the device. As a precaution, then go to phone's bluetooth settings and unpair the old tracker from phone if it still appears paired.
Then, logged into same account on phone (or other sync device), from Account page, click on 'Set Up a Device' and proceed just as when setting up previous device. Data will continue seamlessly in same account.
Before posting, re-read to see if it would make sense to someone else not looking at your Fitbit or phone.
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