My receiver will only show one channel on the TV. It will not respond to the remote control to allow me to go to "Home" or change channels on the satellite that it is on. I have tried to update the software but it will show the "Upgrade" options but I cannot choose option 1 to get it to do the upgrade from the usb. The "oK" button on the front of the unit is not being recognized by the receiver either. I am using software 4931. I have been using the unit since summer 2010, until now without any problems. Any suggestions?