As I am sure many of you know, apple wont allow builds of any os below 4.0. I have heard people talk about ssh backups or something that allow you to restore earlier versions..but im not sure how this works. I pressed that button in cydia offering to make some kind of backup for MC models..and at the top of cydia it now says "This device has SHSHs on file for iPhone OS: 4.0" (even though its a ipod, but what ever). Is this what I need and want? Or do I need to do something else?