However, there is a bad news for the users who are using Windows Phone with the 512MB of RAM; Microsoft tweeted that “We do not have any plans to put W10M on devices with 512 MB”. Thus, some people would likely to argue that their 512MB devices ran Windows 10 Mobile just fine in the Windows Insider program, Microsoft did have to draw the line somewhere. As we already know, that you can upgrade to Windows 10 Mobile it is also necessary to have Windows Phone 8.1 or a later version of Windows. The download is at least of 1.4 gigabytes, so it is necessary to have at least the minimum space available on your Windows device, and it is recommended that you must have any active WiFi network to update your device without any interruption. Of course, it is also advisable to have more than 50% of battery since the installation of the new system requires more than an hour, during which we can not use the phone. — Windows Insider (@windowsinsider) March 17, 2016

Here we have created a list of Lumia devices which are going to receive the OTA update:-

To check if the update is available or to receive a notification when it is available, you can go to Settings -> Updates or download the application Windows 10 Upgrade Advisor.

Now it’s come back for Microsoft

With these phones and update, Microsoft may raise it’s sales lately, but now it’s come back for Microsoft. Some will may try the power of a Lumia 950, but will surely many users are there who may have enough satisfaction with Lumia 640 or 535 even. Between this update and manufacturers, they are joining ( Vaio or HP ) or those who look set to launch new phones with Windows 10 Mobile ( as Alcatel ) Microsoft can regain the path and recover the market. They are aware that they already have a good product, but, now its time to explain and show the general public.