Open the Fitbit app and check for a restart option for your device
If your Fitbit has a button, press and hold the button until it restarts
If your Fitbit has multiple buttons, press and hold the correct button combination for your model
If your Fitbit has a touchscreen, swipe to Settings and look for Restart or Reboot
If your Fitbit is unresponsive, connect it to the charger
Keep it on the charger and try restarting again
If needed, remove the device from the charger and repeat the restart steps
For specific button steps, check your Fitbit model instructions