The SHSH blob/apticket is something that must be saved for the signed firmware at the time. Right now, the only firmware signed by Apple for the iPhone 4 is 7.0.4. So you if you use TinyUmbrella or iFaith, you can back up the SHSH blobs/apticket and use that when the tools are available.
If you don't have the SHSH blobs/apticket for your specific iDevice for the firmware you're wanting to go to, then you simply can't go to it.
Now if you find some way to do it, please share step-by-step on how you accomplished it. It would be very helpful info. To my knowledge, this is not possible unless you have the SHSH blobs/apticket somewhere. Please anyone feel free to correct me if I'm wrong.
12-24-2013 02:55 PM