Please noe as follows;

"IMPORTANT NOTICE:

O.S. Version 4.1B is identical to the version contained on the 'Sound Update' for Audya, with the exception of minor improvements differs only slightly to version 4.1A.
If the 'Sound Update' has already been applied it is not necessary to use this downloadable version.
'Audya 4' and 'Audya 5' owners should not install this version