I'm relatively new to jail breaking, I love my iPhone 4 JB and don't think I could live without some of the features I have installed. However now iOS 5 promises to do the same (or so apple say), it's only natural I want to try it out. My worry is what if I don't like it or it is very buggy/isn't as good as the JB equivalents. With apple not signing older versions of iOS I won't be able to downgrade to a jail-breakable version. I have heard of SSH blobs or something, that allows you to used a saved version to downgrade to. Can anyone link me to, or explain what I need to do? Im currently running 4.2.1, baseband 3.10.01, and use OSX Lion. Thanks in advanced!