first of all,sorry for my bad english.
I wanna tell you about my problem and asking for solutions.
I use iphone 4s with iOS 5.1.1 and I've got it jailbroken. This morning I update my system to the latest iOS (6.1.3 if I'm not wrong) manually from my iphone using wifi. This process was working well until the download finish and preparing update. Suddenly, my iphone was restarting and then it show the screen "connect to itunes".
I've done some way to repair this problem but I still fail

Could you all help me and give me solution of my problem?
thanks before