Who can i update my symbian phone(nokia 6670)?

Updating on your computer is the usual way..phone sellers who import them normally do updating for you also phone retailers may do it for you..
 
I want to update my symbian phone(nokia 6670) but when i enter my settings or tool i can not find update. But i can find update in some phone settings, i wonder why nokia6670 didn't have update.
I know their is another way to update some phones but i dont know how.
Pls help..
 
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