WP8.1 Lumia 630Chinese channel “CoolXap” has posted two videos demoing Windows Phone 8.1 on a Lumia 630. Most of the Windows Phone 8.1 stuff demoed in the first video is known and has been demoed before as well. The second video however demos “how to set start screen background” which is certainly leaked for the first time. Lumia 630 shows itself with its 4.5 inch screen. Videos are poor in quality and shaky, but that’s how leaky videos usually are. Watch the videos below,