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For more information about backing up your mobile device, see Windows 10 Mobile help.
Windows Phone 8.x or early Windows 10 Mobile build From the device, open the Store application, search for and install the Windows Insider application, launch the application and follow the on-screen prompts.
Because we are also validating a build on a smaller set of devices before releasing, there is also a chance that some features might fail in some device configurations.
If Phone Update says your device is up to date, you have the latest build.
The easiest way to go between the Development Branch to the current Production Branch is to reinstall Windows using the Device Recovery Tool: see instructions at Windows Phone Device Recovery. Launch Settings, select Updates & Security, select Windows Insider Program.
Under Choose Your Level, select between the following rings: Fast, Slow or Release Preview.
If your phone isn't listed, and no Insider Preview builds appear under Enroll in the Windows Insider app, then your phone isn't supported and it may or may not be supported in the future.
To see which Windows Phone operating system (OS) version is installed on your phone, go to Settings Before installing an Insider Preview build, we recommend backing up your phone.