Hi folks, I have an AV32R DP with an older version of the O/S - 3.75. It's perfectly stable but if I try to play a new blu-ray DTS disc through it (Downton Abbey) then I can't select anything other than stereo. It says it's switching between stereo and DTS but I can't tell any difference and nothing comes out of the centre or rear spkrs. Am I right in thinking a newer version of the O/S would help? If so, anyone know where I can download one from? Many thanks for any help. Paul.