To my knowledge there isn't a single streaming box that switches modes. The Roku, Apple TV, and chromecast all just do 60Hz. It's unfortunate because we have to rely on our TVs to do the proper pulldown and display content at the appropriate rate. Not all TVs do it or do it very well. The majority of content provided (movies and shows) is in 24p, so it boggles the mind why none of the boxes offer that feature.