So I have transferred all my apps, music, movies from my PC to a new Macbook pro and have authorized the macbook in itunes. I went to add some new music onto my iPhone from the new macbook and itunes told me that I would have to erase all the apps, music and videos currently on my iPhone and sync it with this new itunes library on the macbook. I didn't think it would be a big deal because I moved all my files over to the new macbook anyways, then I thought about this... Will this "erase and sync" process automatically update my iPhone to the newest firmware? I'm currently jailbroken and the last thing I want is to update my iPhone to the newest firmware and lose the jailbreak. And if this process does not automatically update to the newest firmware will it also erase the jailbroken apps as well? If so, does that cause issues in itself? If someone could give me a definite answer on this matter it would be greatly appreciated. Thanks.