Unable to Turn on Data connection and Wifi after the update of Windows 10 Preview

[WPCentral Question]

Unable to Turn on Data connection and Wifi after the update of Windows 10 Preview and the SMS outgoing and incoming is barred.

 

[N_LaRUE]

Hard reset your phone and see if that fixes it.

If not then use this to go back to W8.1 - How can I recover/reset/restore my phone software? - Microsoft - UK

 

[Roland Schlangen]

This works:
1. Make a backup
2. Factory reset your phone
3. Restore the backup