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I have a Lumia 521 phone with Windows 8.1. Recently the phone started to malfunction for some reasons and in the process lost some of the Application data. The app is a Notes App (KeyNote) that had Windows Phone - Wikipedia Syncing content between Windows Phone 8 and 8.1 and Windows PCs or Macs is provided through the Windows Phone App, which is available for both Windows and Mac OS X. It is the official successor to Zune software only for Windows Phone 8 and Windows Phone 8.1, and allows users to transfer content such as music, videos, and documents. root windows phone 8.1 - YouTube
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If you want to update old Windows Phone 8 firmware version to the latest Windows Phone 8.1 Preview firmware version, then your device warranty will be voided until you download and install the official final public release of Windows Phone 8.1 Update and also once you updated to Windows Phone 8.1 then you won't be able to revert back to the previous Windows Phone 8 or earlier version. Windows Phone 8.1 - Project My Screen on PC | Windows 8 Jan 29, 2018
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windows phone 8.1 free download - Windows 8.1, WP tiles 8.1, Windows 8.1 Professional, and many more programs Windows Phone 8.1 - All you need to know! Jul 21, 2014 Windows Phone 8.1 Review | Pocketnow - YouTube Apr 14, 2014