I jailbroke/unlocked using sn0wbreeze on 3.1.3. I want to update to 4.0 for many applications that need 4.0 or later. Which program should I use? (redsn0w, sn0wbreeze...) Do I download 4.1, restore my phone to 4.1 and then jailbreak/unlock? wont I lose all of my personal info?