Upgarade windowsphone developer Preview to Cyan (8.1) without downgrading

The Blue Sky with Clouds on a Sunny Day

How to Upgrade from Developer Preview to Cyan (WP8.1) without downgrade

How To upgrade without downgrading your Windows Phone

So many web Stats showing that users having Windows phone are now registered for Developer Preview.

   This developer preview provides the latest software updates from Microsoft and nothing from Original Manufacturers. So this software provides only software updates and not Firmware.