I have an iPhone 4 on iOS 5.1.1 and is jailbroken currently with Absinthe. I am facing few software issues which I think may be not related to jailbreak. Can i restore this iPhone 4 back to iOS 5.1.1 (same iOS version) using SHSH blobs or something ? If yes then how ? Assume i have the SHSH with me / cydia as well. Will this set the phone as new and i will need to restore back my contacts from iCloud and download all apps again ? Or if i cannot do that, do i need to take special care when updating to iOS 6.1.3 or i do just a normal restore using latest iTunes on my PC ? Anything i need to be careful about ? I do realize i will lose my jailbreak on iOS 5.1.1 and i can do a tether jailbreak on 6.1.3 if i want to.