Check the sticky at the top of the 8300 section. There should be a thread there with the latest OS for your specific device and for the instructions on how to reinstall the OS.
Make sure that you have a back up before you proceed, just in case.
Be patient as it takes an hour or more to do its thing.
And remember, any 3rd party apps will have to be reinstalled afterward and you will also need to resend all of your service books once complete.
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