I was aleady unlock my iPod touch in 1.1.1 version. Sure that OKtoPrep has intalled. But when I upgrade my iPod to 1.1.2,and run jailbreak utility,it prompt an alert window,says "this utility can only used after install OktoPrep 1.1.2." the question is I have installed this utility before I upgrade to 1.1.2. So whatis wrong?