I recently purchased an used iPad 4 16gb with cellular on Amazon. It came with iOS 8.3 but I was sure that I would be able to downgrade to 6.1.3. I need iOS 6 and the iPad has no use to me if I I'm not able to. I've spent the last 72 hours watching all the videos and reading every single tutorial I could find. I tried iFaith, TinyUmbrella, redsn0w and all the usual suspects. I uninstalled and reinstall more than ten different versions of iTunes, tested on two different computers, with three different USB cables and nothing. I'm wondering if there's really no way around downgrading if the SHSH blobs were never saved but I'd like to know if anyone knows it's possible or I better give up, I'm going insane here. Appreciated!