So my girlfriend bought this phone today, and when the phone got all up and running it wanted to do a system update to kitkat, said it would take about ten mins so she does the update and 2 hours later it still wasnt running ( got stuck on a screen that says "Finishing boot" ) after two hours it was rebooted and would not get past the motorola screen, so we took it back and exchanged it, came home and started setting up the new one and its stuck at finishing booting, can someone give me some advice on this