The 3808/4308/5308 have network connectivity and firmware updates/upgrades are available from time to time. Right now the 3808 has an upgrade to include some new features that are now avaialable for the 2309/2809. Those uf us with older 3808s can buy these new features and install them over the network link. if you spent the big bucks on the 5308 the upgrades are free as are the firmware updates for all 3 models. Please note the difference between upgrade and update, the updates fix bugs etc., the upgrades are adding new features.
