I recently upgraded an iPhone from iOS 4.2 to 5.1. I used iTunes to do a manual backup before performing the upgrade. I made sure to be signed into iTunes as the end user while doing the backup and upgrade. The whole process went smoothly.
My boss upgraded an iPad2 from iOS 4.2 to 5.1 and it went horribly wrong. The only thing done differently was he did not sign into iTunes as the end user. When it was time to restore from the backup (during the upgrade process), it kept asking for a password. My boss never set a password. Somehow he was able to re-sync all the apps back to the iPad2, but a lot of the app data was still missing.
So here is my question! Why didn't iTunes ask to set a password in the iPad2 backup? iTunes asked me to set a password during the iPhone backup. Did the iPad2 upgrade process go horribly wrong because my boss never signed into iTunes as the end user?