I have an SMCD3GN wireless modem/router that I purchased some time ago, and it works perfectly on my Charter Cable Internet service. (In fact, it's the exact same model that Charter offers for rental.)
My question is does anyone know where I can get a firmware upgrade for this modem? Is this something that Charter can do, or must I do it myself? and if I have to do it myself, where do I get the firmware file(s)?