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I need help. I got a Samsung Galaxy S4 (SGH - I337) Rooted from AT&T. I got two problems.

First I cannot update my version from JellyBean 4.2 to 4.3. Every time I had downloaded the update when the device restarts and it reaches 21% on the update it said's "Update Fail". What can I do?!

NOTE - (Someone told me that because I rooted the phone I cannot update my phone through AT&T servers)

Secondly my device from time to time restarts it self.

And sometimes the wifi stars connecting and disconnecting every few seconds.

Can anyone help me?

Thanks
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