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I believe the device downloads the update in the background over wi-fi when it is on the charger and then it will let you know when the update is ready to install. I don't know of any way to manually trigger the update.
Warren | Cincinnati, OH
Versa Lite, Ionic, Charge3, Inspire HR, Blaze(retired), Alta( retired),- Pixel 3
Take a look at the Fitbit help site for further assistance and information.
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