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could this be a settings problem? i go into the camera section and i have it on "on" but still not working.
Which device are you using?
the note 3, i also downloaded a flashlight app and its not working either when i try to turn it on.
I would first delete the flashlight app and try.
If that does not work, place the Note 3 in safe mode and see if the flash works
Could just be a bad LED and the phone may need to be replaced if still under warranty
It might be Best to also power cycle the Device once you've removed the app..