I have a tethered jailbroken iPhone 4 and my friends drained the hell out of it by playing games. The problem is I can't "just boot tethered now" because a) the computer that this iPhone's synced with is not within nearby access (I'm on holiday right now and I don't have the laptop with me) and b)I'm using a friend's laptop. Is there anyway that I can use redsn0w's "Just boot tethered" option without losing any data in my iPhone?