As of Microsoft's product page for Windows apparent 10, the update for the launch of Windows 10 Mobile initially only available for a specific range of Lumia devices. According to the blog WMPoweruser popularity and timeliness of the smartphone models are not necessarily crucial to be happy from the beginning with Windows 10 Mobile and features such as the new edge browser to use. Lumia 530, 520, 630 and 635, for example, are lacking, although they are also the most popular Lumia smartphones due to their low price.
Even the camera phablet 1520, the Lumia Icon and the Lumia 730 are missing - even though they have the same specifications as the Lumia 930 and Lumia 735 , which can be updated from the launch date . The smartphone models Lumia 430 , Lumia 435 , Lumia 532 , Lumia 535 , Lumia 540 , Lumia 640 , Lumia 640 XL and Lumia 830 will also be available from the start of Windows 10 Mobile .
To avoid a debacle like Windows Phone 7, Microsoft has promised to upgrade to Windows 10 Mobile for all Lumia smartphones running Windows Phone 8. For devices with less than 1 GB of RAM (= 512 MB), however, it can be assumed that not all features are supported. There may also be adverse effects on applications running in the background.
