my ipod touch 3 genrration update not come can you send
You are talking to other Apple users here, not Apple. No one here can send you an update for your iPod.
If your iPod is a 2nd generation Touch, then it cannot update beyond iOS 4.2.1.
To check which model you have, see http://support.apple.com/kb/HT1353. Pay particular attention to this if you have an 8GB Touch, because if so, it is not a 3rd gen Touch, it's 2nd.
If your iPod has Model No. A1288 etched into the back casing, it is a 2nd generation Touch.
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