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Welcome to the Fitbit Community @Mon69. Thank you for letting us know that your Charge 3 screen is too dark.
In order to make your device's screen brighter I would recommend restarting your Charge 3:
You can restart your tracker from your wrist. Open the Settings app and tap About > Reboot Device.
If your Charge series tracker is unresponsive: .
Your tracker should now work normally. If your tracker still doesn't work after a restart, contact Customer Support.
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