I've upgraded Vista to Windows 8 on VGN-TZ11MN laptop and after that I'm not able to switch on WWAN module. I've tried with many versions of Smart Network, also with 3.12 which should work on Windows 8. Have anybody had the same problem and solved it already?
I might be mistaken but this shows up as a european model and drivers are available up to windows 7 as of the moment. This is possibly a compatibility issue and would need an update directly from the manufacturer. You can try updating your software through VAIO care update by connecting your unit with an ethernet cable until the update is complete.