Apple released iOS 6 Beta for developers with 200+ awesome features and if you have upgraded your Phone 4S, iPhone 4, iPhone 3GS,iPad 3/New iPad, iPad 2 and iPod Touch 4G to iOS 6 Beta 1 and want to downgrade it to iOS 5.1.1 then here is the guide.
Also Read: Install iOS 6 Beta For Developers (Guide)
Downgrade iOS 6 Beta 1 to 5.1.1
1. In the first step download iOS 5.1.1 IPSW for your device.
2. Connect your device to PC and launch iTunes.Put your device in DFU Mode.
To put your device in DFU Mode,hold the Home button along with the Power button for 10 seconds simultaneously.Release Power button but hold Home button for more about 30 seconds.
3. Select your device from the side bar of iTunes.Hold (Shift for Windows) and (Alt on Mac) and simply click on the “Restore” button.
You have successfully downgraded your device to iOS 5.1.1 from iOS 6 Beta 1.