Instructions to revert back to 2.1 from 2.2

Found this link, instructions from Cnet..
http://www.appletell.com/apple/comment/how-to-downgrade-to-iphone-os-2.1/
Has anyone done this successfully or validate if these steps are correct?

Honestly I haven't had any problems with 2.2, at all. If anything it runs better. If 2.2 is installed cleanly, and no corrupt data files from 3rd party apps cause conflicts, then it should all work as designed. If it doesn't then I'd be restoring the phone as a new phone and avoid returning bad data files back to the phone. We don't know if all 3rd party apps can run properly on 2.2 anyway. If 2.2 were inherently bad, we would all suffer the same problems.

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