Reverting firmware back on iPhone

in Genius Bar edited January 2014
I've looked thru the forums, but can't seem to find anything. I've had problems since upgrading my (original) iPhone firmware to 3.0. Parts of my screen are "dead-zones". I thought maybe if I can revert the firmware backwards, then re-install it - something might right itself. Can someone give me instructions to do this? Thanks.
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