I browsed through most of the messages here and I have successfully upgraded my 990 after repeated failures. One issue I have (and maybe it's me) but the audio performance now seems to be flat since the upgrade when listening to regular audio cd's. It appears that there is too much Midrange and the Highs and Bass seem to be lacking the punch they had before the upgrade. All my original settings were restored to the way I had them prior to the upgrade. Also, it seems that I need to raise the volume more than before. Is anyone else experiencing this problem. Also, is there a way to reverse the upgrade?