To view 4K content, users generally need compatible 4K UHD displays, high-speed internet, and hardware like or an Apple TV 4K set-top box. What the Heck Is 4K HDR? - App Store - Apple

The SRKWikipad is a marvel of budget engineering, but it is not a 4K movie machine. While on this tablet under specific conditions (local HEVC files, VLC player, sub-30Mbps bitrate), the experience is closer to very sharp 1080p than true cinema 4K.