I bought a d-link wireless gaming router, and setup was a real pain. So, I returned it, and bought ethernet over power devices from linksys, and they work great! Plugged them in, connected one to the router, and the other to the 3808, and wala...update was successful. Ethernet over power is awesome...and very reliable...no hiccups in the wired connection!
NOTE: The update did freeze, at one point, so, I restarted it all, and second time around, it was fine. There were lots of things that seemed to get updated...took over 2 hours for everything...but, it did all go through.