The remote session with Innuos this morning did not solve my issue. It appears that the part of the upgrade disabling the IPv6 is causing some problems. I am awaiting instructions to return my Zen mk ii for repair.
Good news! The second remote session with M. Vittorino was successful. It took nearly 2 hours and a connection to a monitor and keyboard. In my case the problem was a library fault in the 1.4.6 update. It was very late in W. Europe when he finished, and I really appreciate the effort.