how to restore iOS 5.0.1 to 4.3.5

[yogi.techsavvy]

have updated my iphone 3GS to iOS 5.0.1 now its responding to late, hangs somtime while playibg games it really irritates me... 😱😱 plz help me out how can i downgrade it to iOS 4.3.5 or 4.3.3..........
FYI: its not jailbroken

 

[iBar]

have updated my iphone 3GS to iOS 5.0.1 now its responding to late, hangs somtime while playibg games it really irritates me... 😱😱 plz help me out how can i downgrade it to iOS 4.3.5 or 4.3.3..........
FYI: its not jailbroken

Try this.

http://cydiahelp.com/downgrading-from-ios-5.0.1-on-iphoneipad-and-ipod-touch-step-by-step-guide/