iOS 5 Beta 6 has been released but in order to sync iDevices having iOS 5 Beta 6, you’ll need iTunes 10.5 Beta 6 which is also, only available to registered Apple developers.
This release can be downloaded legally by registered Apple developers. Membership for Apple developer’s account can be attained with a fee of $99. By being a legal member, you can get your hands on pre-released iOS versions, developer’s tools and documentation. The subscription to these accounts can be gotten by Apple developer website for minimal charges of $99. We strongly recommend our readers to get their iTunes app legally in order to be on the safe side.
Note: iDevices running earlier versions of iOS will not be able to sync on this iTunes update.