Keep reading, he says he has a 1k2 dish. The Dish menu's only allow you to select a Dish 300, 500 or Superdish. That is why he said a 500.
The proper method is not to select which dish. What needs to be done is go point dish, select one of the sats you are pointed at, wait till you get a lock and the sat is named and then press done. Then you will download all the updates. I discovered this when I replaced my 722. I'm on the earc and it wanted to point towards a warc sat if I selected what type of dish.