Update changes the codes. I did not run the update on two sets as we are not using any smart features or rs232. I didn't notice much picture improvement after the update, so we just left them as is so we don't have a tv lock up or worse. The client did an update after the guy at the Sony store told him alllllllll about the amazing smart features (we are using Roku there). Next thing you know, he's calling cause nothing works. Input commands changed and now he was seeing a blank screen or the Yamaha Piano background, depending on which TV he was looking at.