That's unfortunate. With the sdp-55 I've never had issues with LFE being missing with DTS tracks. If you hare having that issue I don't think a firmware change is going to fix it. Either you have a bad unit or there is something else going on with your configuration.so this was the last one for me I am returning the device, again there is no lfe channel with DTS tracks. So now hoping the dealer is accepting this whiteout a fight or going to court.