Community Moderator Alumni are previous members of the Moderation Team, which ensures conversations are friendly, factual, and on-topic. Moderators are here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
Hi @zoe40,
I'd recommend the following steps to help get your Flex syncing again:
1. Restart your Flex.
2. Reboot your iOS device.
3. Open your iOS settings > turn off Bluetooth for 10 seconds > and then turn Bluetooth back on.
4. Open the Fitbit App to initiate a sync.
Hope this helps you out!
Best Answer