How to update Microsoft lumia smartphones to windows 10 OS

Now we can very easy to update Microsoft lumia smartphones which works on windows 8.1 os to windows 10 os by usind a simple application Windows 10 Upgrade Advisor app.This app is now available in windows store.

where you can easily check for upgrade availability and begin the upgrade in just a few easy steps.

Now the windows 10 os available to the following Lumia  running Windows Phone 8.1 Denim: Lumia 1520, Lumia 930, Lumia 830, Lumia 735, Lumia 730, Lumia 640 XL, Lumia 640, Lumia 635 (1 GB RAM), Lumia 540, Lumia 535, Lumia 532, Lumia 435, and Lumia 430.

Before updating you should backup your phone