Press and hold all three buttons on the Ionic until you see the Fitbit logo.
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More than likely your ionic will brick itself if you do a factory reset, mine did.
This guide does not show how to do a factory reset but rather shows how to force the device to restart.
Yes I bricked mine too
Thank you for this. I accidentally discovered this. It took 8 hours to not get this suggestion from Fitbit support.
Thanks Carlos. My main screen was black this morning. I could swipe to other screens, and found instructions about powering down using the Settings etc, but Settings just stayed on Settings for me, so I had to find some way of using the buttons to restart. I found this! It worked for me. Back to normal after restart.