One of the problems in addition to restarting the phone and the solution is to upgrade the system, is generally a system problem.
The first step, brush machine ah, this do not use to teach you how to brush, apple mobile phone brush through itunes to upgrade, we can phone shutdown after we hold down the home button to insert USB can enter the itunes mode and then can go into the brush mode.
The second step, open Itunes,itunes will find a need to restore the device, in the itunes mode, do not point to update or restore, click to cancel;
We then "restore the IPhone" after pressing the shift button on the keyboard and then select the iOS software to upgrade.
The third step, the last is activated, after the successful activation of the problem may be solved.
Another way
is to use the online upgrade mode of the oat to upgrade, this is very simple in the settings-software-update can be found.