For those downgrading from iOS 5.1 or iOS 5.1.1, I have successfully restored from my iOS 5.1.1 backup and kept all my settings after the downgrade. I don't know if this is common knowledge, but just in case, here's how I did it: (These instructions are for OS X) 1. Find your iOS backup file. (On a Mac, it's located at /Users/Library/Application Support/Mobile Sync/Backup 2. In the big jumble of files in there, find info.plist 3. Open info.plist with TextEdit 4. Locate <key>Product Version</key> <string>5.1.1</string> 5. Change "5.1.1" or "5.1" depending on which version you're downgrading from to 5.0.1. 6. Save the file. 7. Restore your iPhone/iPad with Redsn0w. 8. Restore to that modified backup with iTunes. 9. Enjoy! 10. Profit.