If you have a Lumia 630, Lumia 638, Lumia 635, Lumia 730, Lumia 636 or Lumia830 first load first Windows 10 beta on your device.
Justfollow these quick steps:
- Launch Settings ->About -> Info
- Sign up to the Windows Insider Program. If you haven’t already you can follow this link:
- Download and install Windows Insider app from Windows Phone Store
- The final step is to follow the upgrade progress launched by the app (while your phone is charging via HUB IT, to ensure that your phone doesn’t turnoff during the upgrade)