iOS 4.3 was released earlier today for iPhone 4, 3GS, iPad, iPod touch 4G, 3G and Apple TV. So if you upgraded to iOS 4.3 beta, 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, 3GS, iPod touch and iPad to iOS 4.2.1, 4.1, 4.0.x.
