Yep - boy in the office with a 3G had strife. I didn't, but I'd done me some booklearnin'

Basically, what you want to do is do a full sync backup of your phone. Then restore down to factory defaults - you'll get a "Restore and Update" option in iTunes, as long as it's already checked for new updates and found iOS4 ready to install, which will give you a fresh, unadulterated brand new iOS4 installation.

Then you just restore your backup over the top of that. Took me an hour or so (because after restoring the back-it has to resync all your music etc), which is far fewer than the several hours it took laddo in the office who just clicked the "Upgrade" button in iTunes.

This is what I followed: User Posted Link

Posted By: Arizona Bay, Jun 25, 11:40:41