Shield TV 2019 Tube Support Request

I konw the android version work well on Shield TV Pro, but the tube never! the low memory(2G) makes it can't do local playback well, especially in large UHD Blueray playback（over 80G, eg:Billy Lynn's Long Halftime Walk）, it get buffering offen (Unlock Kodi Advanced Settings can't make it better, I have a 1G lan, and my oppo203udp works perfectly). So my tube is unused for 2 years, update the firmware to 9.1.1, the things never change.