I have a Microsoft Lumia 520 and tried to install the Windows 10 preview. It was updating and showed the two gears moving. It was almost complete when it turned off, rebooted, and showed the gears again. Then it turned off and repeated the process. It keeps doing this over and over again. How do I fix this problem? Any answer is appreciated. I used windows phone recovery tool but it does not recognize my phone as it is not started. plz help me with the issue.