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"Remember that bit where I said upgrading from 1.1.1 to 1.0.2 was a one-way trip? Looks like I spoke prematurely. Tonight, reports are trickling in about successful 1.1.1-to-1.0.2 iPhone firmware downgrades using this method described at the \"iPhone Devteam\" wiki, which relies on a combination of firmware-fu and the INDependence software. TUAW reader skwasha tipped us off to an ongoing conversation at the hackint0sh forums that got the ball rolling on this.I have not yet been able to confirm this downgrade so let us know in the comments if the method worked for you or not.Update: After downgrading your iPhone will most likely not work as a phone. But you'll be able to use it with third party apps and WiFi. Developing.Update 2: More detailed instructions here at Nate True's blog.Update 3: This method is now called \"pulling a kmac\" after the original poster who figured this out.Update 4: If you're getting the \"Please Connect to iTunes\" thing, you'll need to set some environmental variables. You can do this with either iBrickr/iphoneinterface or with iPHUC. Instructions for both at Nate's blog."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2007/09/29/breaking-reports-of-1-1-1-to-1-0-2-iphone-downgrades-trickling/>