Hi Tony, our earlier version of the firmware is V. 1.09. Your updated firmware is V. 10D. Another friend of mine who live in the USA also received the V. 10D and he, like you, found no difference in sound quality as compared to V. 1.09. However, my updated version of the firmware has a vast difference in sound quality as compared to V. 1.09. I can't be wrong because I have been relistening to countless SACDs for over four months already and the dramatic improvements in every aspect of the sound are unmistakable! And I am not alone in hearing the vast improvements according to my dealer.