Hi there i have an iPhone 4S running iOS 7.1.2 which gotta the problem of shutting off with the battery almost full. I dont know if its a hardware issue, but I'm hoping that is a software issue so I'm trying to do everything I can to isolate and software issue. I did a reset on iOS but it didn't solve. The next step should involve a DFU reset using iTunes but it will update my iPhone to iOS 9 and as far as i know it will turn my iPhone unusable. The other possibility is revert it back to iOS 6.1.3 but it goes wrong, I will must make a restore to iOS 9 which will be a problem anyway. So, is there anything I can do without performming update to iOS 9 ?