I just upgraded my iPhone 3G to 4.1 using snowbreeze to make a custom firmware so it retained the baseband 05.11.07. I then unlocked it using ultrasn0w through cydia. Everything works fine apart from the sync problem.

The problem is that when i plug the phone into my computers (windows 7 ultimate and xp pro) and try to sync with iTunes 10 I get the error "iTunes could not back up the sync "iPhone" because a session could not be started with the iPhone".

I also get a similer error when trying to restore or back up. I did have a good search of the internet and this forum trying to find a solution but failed. I did see something stating that the iPhone needs to be locked down after a jailbreak but im not sure what this means.

Help would be greatly appreciated.