Apple released iOS 4.3 beta with a lots of new features and bug fixes over 4.2.1, but we still don’t have any fully compatible jailbreak at the moment. So if you upgraded to iOS 4.3, and now you want to downgrade back to iOS 4.2.1 or 4.1, follow the instructions posted below to downgrade iOS 4.3 on iPhone 4, iPhone 3GS, iPod Touch 4G, iPod Touch 3G and iPad first generation to iOS 4.2.1, 4.1 or lower. Make sure you have saved your Cydia SHSH for the firmware you want ...