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If this happens fitbit suggest:
"Note that if you see an error screen after changing the clock, restart your Blaze and try updating the clock again. For instructions, see How do I restart my Fitbit device?"
taken from: https://help.fitbit.com/articles/en_US/Help_article/2311/
It might be worth trying even if the error wasn't the result of changing the clock.
Best AnswerAfter 3 months of frustration by having this problem with my fitbit blaze, "Setting up a new device" method worked successfully for me. Forum did not help, but this video did:
https://www.youtube.com/watch?v=lnlHwC7FMxU
Hope it works for you too!
Best Answer