TS3694 How to downgrade from 4.2.1 to 3.1.2

I have I phone 3g, Earlier i had software ver 3.1.2 where Camera and sound was ok.
Now Its not working after upgrade
Itunes         : 10.6.35
Software Ver   : 4.2.1 (8c148)
serial number  : 87xxxxxy7h
modemfirware   : 05.15.04
imei           : 01 202000 671067 1
model          : mb489b
Please help me

Thanks for responding quickly, Appreciate your help
I have never dropped the phone, But i did reset all content and settings and did a restore.
I will try your suggestion
"hold both the home and sleep buttons until the phone powers off, keep holding them until you see the apple logo.  Once the logo appears let go.  Then try a call and the camer and see if they are functioning normally"

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