Maati: Microsoft unveiled Windows Phone 8.1 a few months ago. Up until now it has remained under a developer preview, with only a few devices such as the Lumia 630 having it preinstalled. Lumia Cyan is the firmware by Nokia that comes with the 8.1 update. Today, after a long wait, the Lumia Cyan update along with Windows Phone 8.1 will begin rolling out to all Lumia devices across the world. As it is always the case, the schedule will vary for each region.