Just updated my iPhone 5s from ios 8.1 to 8.3. After the install it asked for Apple ID and password and to allow it to sync to Mac and iTunes. After following the steps my phone kept restarting - turning on and off and goes blank. How do I fix this??

Just updated my iPhone 5s from ios 8.1 to 8.3. After the install it asked for Apple ID and password and to allow it to sync to Mac and iTunes. After following the steps my phone kept restarting - turning on and off and goes blank. How do I fix this??

I have had about 9 iOS devices at work do this. 
The fix and it will wipe out anything on your iphone is to connect it to your computer and have the latest version on iTunes open.  Hold the Power/Sleep and Home button till it blanks out.  Keep holding the home button untill it says recovery mode on the screen of the computer and do a restore.

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