Windows Phone 8.1 is finally available to developers and those who just really want to try it out. It’s actually not too hard to get it on your device. It only requires a couple quick steps and then you can run the latest and greatest version of Windows Phone yet!
1. Sign up for a developer account in the Windows Phone App Studio
This step doesn’t cost you anything and only requires a simple sign in. Be sure to sign in using the account you have on your Windows Phone that you want to install 8.1 on.
2. Next you need to go over to your Windows Phone device.
Open up the Windows Phone Store and search “developer preview”. The first result you should see is the “Preview For Developers” app. You will need to download that app. Once it is downloaded simply sign into that same account you used when signing up for the App Studio.
3. Check for updates
If you have followed these steps correctly you should now be able to update to Windows Phone 8.1. You can do this by heading to your Settings application and then going to Phone Updates. Simply download the available update and the phone with update itself to Windows Phone 8.1. The update process does take quite a bit of time. For myself it took about 30 min in total between downloading and installing.