Nokia Lumia 625 was the first Lumia device with 512MB RAM to be updated to Windows Phone 8 GDR3 and now others lumia’s are joining the Que. Starting today the Windows Phone beginner for Nokia, the lumia 520 will receive and update to Lumia Black Update which is cooked over the WP GDR3 release. The update brings many new features and improvements for the Lumia 520, though some of them shal not be there because of the low RAM amount, these include Nokia Refocus and Nokia Beamer, additionally the Glance screen is also not there.
The Windows Phone 8 GDR3 update will allow you to close apps from the app switching UI directly and auto rotation can now be switched on/off and Bluetooth 4.0LE support. Other from the Lumia Black include the driving Mode, Bluetooth tethering, Storage management, custom ringtones for messages, Nokia Purview camera and new accessibility options, you can also move apps into folders now. There is also an indication about the double tap to wake feature making way to Lumia 520 and 720.
The update will show up on your device automatically once available but you can also check it by visiting Settings > Phone Update > Check for updates. You may also visit the source link in case you are facing difficulties installing this update.