Unable to update firmware

Hello to everyone,
As I wrote In my first post, the real issue regarded the unavailability to use MPW and have the normal performance, then I tought that, probably, with the update I could solve it. I don’t know how, but after a soft reset it update by it self to the xxx.xxx.17, anyway the performance were the same. As I wrote a symptom of my problem was that in the dashboard wasn’t displayed the cake graphic, therefore I thought that could be something on the index. I was determined to format the driver, then before that I tryed to use the “s.o.s” function in my macbookpro, was good, because after that I come back to the proper performance and the to display the information regarding the driver. Just for information, I come back to the previous firmware (xxx.xxx.15) because with last one I cannot use the DLNA function, that’s a probably bug I hope will be solved on the next release.