I updated my Lumia 925 to Denim, but a strange thing happened after the upgrade; I can't select 3G. The drop-down list freezes on 2G. How can I fix this?
As Apoorv mentioned you could try and make a reset. But before that you should:
- Check if there is another update available. Including installing and running Upgrade Advisor from Store.
- Remember to have backup activated before you do.
- Take note that there are two kinds of resets that you could do: Hard and Soft (always try soft first). You can read how to do both kinds of resets here.