Do you know when the previous owner purchased it? 950's manufactured after December 17, 2002 should not have any dot on them, as they started out life as the "blue dot" version. Likewise, if it was shipped from Outlaw after some time in March 2003 it already has the DTS-ES update. If you can ask the previous owner when he bought it (and if it was prior to March '03 if he did the DTS-ES fix), that would answer all of your questions. If not, contact Outlaw (they have a tech support site if you don't want to call from overseas) and give them your serial number. It may take them a couple days to get back to you right now, though - much of their staff is in New York this weekend for a trade show.