Jailbroken iPhone 5 with iOS 7 charges from wall charger but is not detected on iTunes except in DFU mode

Hi, I have an iPhone 5 with jailbroken iOS 7. It charges from the wall charger but it can't be detected on my PC except in DFU mode and iTunes asks to either restore or update. I don't want to do either as I have no backup and don't want to upgrade to iOS 8 and lose my current jailbreak.

Initially I thought it was a jailbreak or Cydia apps problem, but after booting in the "no substrate mode" I still got no difference in the detection via the iTunes.

Any help would be greatly appreciated. THANKS in advance :D