That didn’t take long, the Redsn0w team have jailbroken the final version of iOS 4.2.1 — there’s also a how-to guide, so all you more technically literate iPhone users out there can get out there and partay!
A tethered jailbreak, Redsn0w 0.9.6b4 is based on Geohot’s Limera1n bootrom exploit which has already pwned all current iOS devices for life.
Get thee to Redmond Pie for the deets.
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