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Restart the Flex once again and leave it plugged in and charging.Tap on it repeatedly for a couple of seconds to leave the Activity Mode, then try the following when before setting up your tracker as a new device:
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A screenshot of the error if you see the lights on the Flex moving back and forth, that indicates your tracker is in Activity Mode, which might explain why it's not possible to be set up.App version currently installed in your mobile device.OS version your mobile device is running.Mobile Device you're using to update your tracker.Please try that and let me know the if you're still getting the same message I would like to gather some information from you so I can check this situation further: Please remember that if you have a desktop computer, you will also need a USB dongle (which was included with your Flex) to sync or update your tracker. Now, if you have a computer with Windows 10, you will need to download the Fitbit app for Windows 10 and use that instead of Fitbit Connect. Hello everyone, I hope you're having a great day! It's great to see you have a warm welcome to the Fitbit are you still getting the error 500 when trying to update your Flex? If so, please let me know.
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