iphone upgrade 3.1.2 to 5.1.1 lost all messages and notes
I just upgraded an iphone 3gs from 3.1.2 to 5.1.1 and it properly updated the firmware then at the end tried to restore the data. While restoring it kept prompting me for a password which I don't have any setup so I pressed cancel and it started synchronizing but my messages and notes are not showing up! I'm particularly concerned because I checked the size of the backup and it's like 200 mb! that seems very small.
Is there a way I can fix this so it sync back everything properly and otherwise how can I restore to my previous backup with the previous firmware?
iPhone 3GS, iOS 3.1.2