My IP4 was jailbroken on 4.0.1 and I have been using it for couple of months with no problems. Tonight I planned updating to 4.1 then jailbreaking again, but I am having a problem updating with iTunes 10 on my Mac. The update progress bar is displayed on phone screen. It gets to about two-thirds complete then nothing else happens. The first time I left it for nearly an hour and the progress bar didnt move at all. I have stopped previous updates, reconnected and tried again, but same thing is happening. Any ideas please?