I'm guessing it won't work. Xbox One according to Microsoft is hit or miss with the H.265 HEVC codec also. You might have just got lucky. Note, standard blurays use the H.264 codec while the newer 4K blurays use the H.265. They are based off the same concept but the implementation is different. From what I've read it takes more than a firmware upgrade to process H.265 but I have no direct experience. I'm still living in the 1080P world.