Downgrade iOS 4.2.1 to iOS 4.1, iOS 3.2.2 without SHSH Blobs is a post from: Gadgets DNA
Right now specific models of iPhone, iPod touch, and iPad running iOS 4.2.1 can be Jailbroken using the “tethered” method using redsn0w. If you are already stuck on iOS 4.2.1 without having saved SHSH Blobs in Cydia and still want untethered jailbreak, then don’t you worry. iPhonix [...]