After Update to GDR1 no recognition of internet

[WPCentral Question]

Hello,

I've got a big problem. Since the actual update of my Nokia Lumia 920 to 8.1 Update GDR1, my phone does not recognize my internet connection.
Neither Wifi nor data connection via cell.

Please help and give me a solution. Do I have to make a reset?

Best regards
Malik Malak