Hi,
I am confused.  As far as I know, there are no firmwares numbered above the 1.xx series for the DNS-325.  If your machine says it is running 2.00, it seems like the unit might actually be the DNS-320 not the DNS-325.  If you actually have the DNS-320, there is a newer firmware which can be found at this link, http://forums.dlink.com/index.php?topic=41487.0 
Hope this helps to sort things.