Just want to report that I got a 7730L in yesterday and I was able to tether it up. It took a little work though, for some reason it did not tether automatically. I had to fiddle around in the tether menu of the AR300-M and select the eth interface a few times before it finally brought up the Ethernet. I’m hoping that won’t be required every time I would reconnect the setup as it will be a bit of a hassle; fortunately, this one pretty much will stay connected so it shouldn’t be a huge issue either way. I’m just relieved that it works 