Official change log for iTunes 10.5 Beta 5
- The version of iTunes that comes with beta 5 cannot sync devices that have the beta 4 software installed. To avoid this problem, do the following:
- Sync any devices that have beta 4 installed to the version of iTunes that came with beta 4.
- Upgrade iTunes to the version that comes with beta 5.
- Connect the device and install the beta 5 software. (Understand that you might see a failure to sync error when you first connect the device.)
- After installing the beta 5 software, restore from your the backup you made in step