How to recover my nokia 6300 bec. it automatically shutdown while updating and now canot open so far

This is something you need to be very carefull about when updating, when the new firmware is insalled the old one is removed first and since the insallation process wasn;t completed there is no way you can turn the phone on--It's the same thing as try to turn a PC on without it having windows insatlled. You dont need to worry about this however, stuff like this always happen so all you need to do is take the phone to a Nokia service center and let them install a firmware on the phone!