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There seems to be a specific problem with some of the "lite" phones. Fitbit say:
"Due to Bluetooth issues that prevent certain devices, like Fitbit devices, from syncing, our products aren't compatible with the following phones:
Taken from: https://help.fitbit.com/articles/en_US/Help_article/2315/?q=p8
My reading of that is that fitbit are unlikely to be able to sort this out and add these phones to the list.
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