OK. I have had a iPod Touch 2nd Generation jailbroken. I saved my .shsh blobs on 4.2.1. I am buying an iPhone on 5.1 tomorrow. Can I use my .shsh that i saved w/ my ipod to downgrade the iPhone to 4.2.1 so that i can upgrade to 5.0.1 so i can have an untethered jailbreak?