just walked into the room turned on the tv and happened to see this neat new screen
says:
hopper receiver is in standby
hopper s401 is up to date
downloading guide update 70% complete
press select to interrupt download and watch tv
My experience has been that it sometimes doesn't do anything. When Speed changed to FS1 I turned off the receiver to allow it to update the guide. After it was 100% complete checked the guide no change, tried again didn't work so then did a check switch and it updated the guide, properly.