Update, Restart, and Erase
Some troubleshooting steps may require you to restart your watch, while erasing it is useful if you want to give Sense to another person. Update your watch to receive new Fitbit OS updates.
Update your watch to get the latest feature enhancements and product updates.
When an update is available, a notification appears in the Fitbit app. After you start the update, follow the progress bars on Sense and in the Fitbit app until the update is complete. Keep your watch and phone close to each other during the update.
Updating Sense takes several minutes and may be demanding on the battery. We recommend plugging your watch into the charger before starting the update.
For more information, see the related help article.
If you can’t sync Sense or you have trouble with tracking your stats or receiving notifications, restart your watch from your wrist:
To restart your watch, press and hold the button for 10 seconds until you see the Fitbit logo on the screen, and then release the button.
Restarting your watch doesn't delete any data.
Sense has small holes on the device for the altimeter
To turn off your watch, open the Settings app Shut down.
To turn on your watch, press the button.
For information about how to store Sense long term, see the related help article.
If you want to give Sense to another person or wish to return it, first clear your personal data:
On Sense, open the Settings app About Sense Factory reset.