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How To: Revert to iOS 4.3.3 from iOS 5 Beta 1

22.06.2011
There's a reason it's called beta software. While Apple's latest developer build is certainly a glimpse into the promising future of iOS 5, it's not for everyone. Missing features, broken apps, and general quirkiness is abound- though you can't say they didn't tell you so: Apple specifically recommends only installing beta software on dedicated testing hardware. They also warn that once you install iOS 5, there's no going back.

Maybe you're a developer and you need to revert back to iOS 4.3 to test your app for immediate release. Or maybe you're just an eager beaver and got your developer friend to install the beta for you, only to find out you should have heeded Apple's warning. Whatever the case, contrary to popular belief, you can downgrade from iOS 5 beta. Here's how:

This method has been tested for downgrading an iPhone 4 running iOS 5 beta 1 to iOS 4.3.3 using iTunes 10.5 beta (which you needed to install the beta OS). Any other hardware/software configurations may yield different results.

0) Plug your iPhone into your computer

Launch iTunes, if it doesn't automatically.

1) Enter DFU mode