Until this week all Beo6's had firmware version 1.01a installed which did not support WiFi
To use WiFi with the Beosound 5 you must remove the Beosound 5 from your Beo6 configuration, then add it again and when the updated configuration is download to the Beo6, the B&O Configuration Tool will automatically update the Beo6 firmware to version 2.11a at the same time as the new configuration is downloaded.
You will need to take your Beo6 back to your dealer for this to take place.