I have a iPhone 3GS with iOS 3.1.3 in my job. I have to update it to 4.1 and after I need to go back to 3.1.3. We have only this iPhone with it, so if I do something wrong, I will never can go back.
I run TinyUmbrella and it save the SHSH for 4.1 , 4.3.5 and 5.0bx iOS. But, why it don't save for 3.1.3? This mean, if I update it, I will not go back to 3.1.3??
Why it not save for other 4.x versions?? Am I doing something wrong?