My understanding is most of the time this is not an "update" in the computer term. No software gets changed. Most days it is simply and update to the guide data. Not to say there isn't a check of the condition of the receiver or something. I have no idea. But even if you set a receiver never to update software it will still do an update of the guide data daily. As the OP and I and others have pointed out 3 AM is not the most convenient time for many customers, which is why, I presume, Dish gave us the ability to set the update time on a generation of receivers. That they dropped this feature on the Hopper seems illogical and I hope they restore it.