I got my dad a new iphone so he gave me his iphone 4 (which was actually mine that I handed down to him) it's currently running 6.1.3 and I'd REALLY like to get it on 6.1.2 so I can jailbreak it but I don't have any shsh blobs and have no clue how to downgrade to 6.1.2, anyone out there know a way I can do this?