A few days back Apple announced the availability of iOS 4.3 software update while revealing iPad 2. Today they have released the final build of the iOS 4.3, and it is now available for download. This update is compatible with Apple iPhone 4 (GSM model), iPhone 3G S, iPad 2, iPad, iPod Touch 4G, 3G and Apple TV. Apple servers are slow and busy at this point as thousand of people are downloading the update using iTunes interface. Alternately, you can download iOS 4.3 IPSW from the following direct links and update all supported devices using an offline method.
All new features of the iOS 4.3 update are given here.
iOS 4.3 IPSW direct links
Download iOS 4.3 IPSW for Apple TV here.
OS 4.3 is a free update for all existing Apple customers.
How to upgrade to iOS 4.3 offline using iTunes:
First download the latest version of iTunes here.
Now connect your idevice to your Windows PC or Mac.
When detected, right click on the Phone icon in left pane and then backup the apps and settings.
Now download the iOS 4.3 ISPW.
From the right pane of iTunes Window, click on shift key+restore button (Windows) or Option+restore (in Mac) and point it to the downloaded file.
iTunes will now install the iOS 4.3 update and your device will restart with new OS after sometime.
Now you can restore the backup and continue using the device as it was before.