Ok i have a iphone 4 made a mistake of upgradin to ios 6 now how do i de-upgrade

i have a iphone 4        maybe 1 and a half yr old just upgraded to latest ios 6 and whoh!!!!
it worked for a week fine but now it keeps hanging for each and every thing i open ]
WHAT DO I DO!!!!!???
PLEASE HELP!!!!!

Not possible.

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