In the video above, we show you how to install the Windows Phone 8.1 Developer Preview on your device. Note that the the preview might void your warranty.
- Become a “developer”
- Install the Preview for Developers app
- Launch the Preview for Developers app, check the box, click “done”
- Go to settings -> phone updates, and check for updates
- Install the 8.0.x update, preparing you for 8.1
- Then, check for updates again, and install the 8.1 update