4K upscaling is the process where the player enhances the original input resolution. For the process to function the input quality must be Full HD (1920x1080). The player will upscale the original resolution from 1920x1080 to 3840x2160.

4K native content means that the input resolution is already 3840x2160 (4K).

Although both native and upscaled offer the same resolution, native 4K is better as the picture contains more detail. Using upscaling detail cannot be added.