IPhone 4 breaking after updating to iOS7?

I have an iPhone 4, and after updating to iOS7, the phone would suddenly turn off. When I try and turn it back on the screen goes bright with lots of blue-ish lines running across it, then the display gradually goes darker.
The phone hasn't been dropped or water damaged, and I have owned it for 14 months before these problems suddenly started after updating it.

You need to do a software just go to your nearest mobile service center and they will help you

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