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When I went to throw settings, and tap "+ add new device"
It say "Unfortunately, com.sonymobile.connectivitycenter has stopped."
But I didn't even change any setting
Someone help me, please:(
Maybe a glitch.
Anyway,go to Settings > Apps > Swipe to the most left pane and click on "com.sonymobile.connectivitycenter" . If you found it disabled,enable it.
If that doesn't work,Clear Data for it.
Restart your phone and try again.
Hope that helps 
Reload the firmware or wait for 4.3, if it helps you ,its good for you but if it does not then, go to the nearest Sony Service Center, they might fix it for you
All you need to do is go to Settings---apps---uninstall update for smart connect, and everything should work fine:smileysmileywink:
SOlved my 4.3 upgrade issue with my SP 
However mine has stopped working again! Checked Smart connect and updated installed.......
I just uninstaled again and still does not work, phone actually rebooted
Update file is 5.7.4.47
Factory is 5.4.8
How do I stop Smartconnect from updating. It's updates as soon as I turn WiFi back on!!!!