Bluefreeze

Bluefreeze is a tethered downgrade solution by a group called the Private Dev Team. It allows the downgrade of an device on iOS 5.0.x, 4.3.5, and 4.3 without SHSH blobs saved via TinyUmbrella or iFaith. iDevices that are supported are iPhone 3GS, iPod touch 3G, and all A4 devices.

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 * Windows