Guess what? It turns out downgrading your iPhone from iOS 6 beta 1 to currently jailbreak-able iOS 5.1.1 is basically easy. Many registered Apple Developers may probably know this already especially for a daily iOS tester. However, since the method to installing iOS 6 beta 1 without UDID has been leaked out and the way it’s done is practically easy, hence many non-Dev users have tried installing iOS6 B1 on their iDevices.
And if you are one of those “unofficial” beta testers and then found out that all new features offered are not as worth as its buggy performance, simply read following steps to bring your iPhone, iPod, iPad running iOS 6 beta 1 back to iOS 5.1.1 (current stable and jailbreak-able formware).
How To Downgrade iOS 6 to 5.1.1
p.s: We’ll use the word “iPhone” but it represents other iDevices including iPod Touch and iPad.
Turn your iPhone off
Launch iTunes up on your PC/Mac.
Plug it into your PC / Mac via its USB cable.
Now on your iPhone, hold down Power and Home buttons on at once for 10 seconds then release the power button while still holding down Home button. Release Home button once you’ve seen iTunes notify you that your iPhone is already in Recovery mode.
On iTunes, hold down the Shift key on Windows or Alt (Option) key on Mac and click on the Restore button. And do the restore.
Why downgrading iOS 6 beta to 5.1.1 can be done so easily? That’s because currently iOS 5.1.1 is the latest public version available which is still signed by Apple.