I am have a problem with my iPhone 4. It was jailbroken with Cydia and I was going to sell it as I have a 5. When I tried to erase all my info using the erase all content and settings command I seem to have lost my jailbreak and I can only get the phone into DFU mode. I found a link to previous versions of Apple's iOS but from what I've managed to understand from reading other posts is that I also need a saved SHSH. I admit that I am not entirely sure what the SHSH is but I tried to use Tiny Umbrella and according to TU's log it found no SHSH on the phone. Is there a way to restore to a previous OS that will still allow me to jailbreak the phone and not update the baseband?