Hey guys, first I am sorry for my bad English. I am not an English speaker. Anyway, I have a non-jailbroken iPhone 4S and it runs iOS 6.1.3 but today a problem is happened. My iPhone doesn’t boot. it caught in reboot loop. I know if I enter DFU mode and restore my iPhone using iTunes, it’ll be fine but I don’t want to update my iPhone to recent iOS nor jailbreak. How should I fix my iPhone without updating/jailbreaking? Please help me!!! P.S. It's the first time to post on this website. If I break the website rules, please understand it and let me know. Thank you.