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Try this please.Plug your charging cable into your computer.Plug your Flex into the charging cable.Insert a paperclip into the small pinhole on the back of the charger. NOTE: if your model does not have the pinhole follow the steps below....Hold down the paperclip for 3-5 seconds.Unplug the Fitbit from the charging cable.Then check for normal operation please.
Instructions for models without pinhole...