Apple has just released a new operating system which is IOS 5, the latest Update'IOS 5 "brings many new features for IOS platform, among which Notifications,iMessage, wireless syncing, iCloud support, Twitter integration & Reminders.
You can update to IOS 5 through iTunes, just plug in your gadgets and iTunes willautomatically detect updates for you, but do not forget for make backups before continuing updates
In addition to updating via iTunes, you can also download the IOS 5 IPSW directlyfrom the link below and install the firmware manually.
**Build number is 9A334, these links are hosted on Apple’s servers, if you are having trouble downloading IPSW, right-click and choose “Save As” to download iOS 5