Have not been able to get any UHD feeds from the Amazon apps from either my tv..JS8500 or my k8500.. Complained to Amszon got this response,which I post partially..also running download speed of 50 :
Message From Customer Service
I'm sorry to hear about the issue you're experiencing.
Please note, at this time, Ultra HD videos playback is only supported on the following Amazon Video compatible devices:
Set-top Boxes & Streaming Media Players*
-- Amazon Fire TV (2nd Generation)
-- Roku 4
*These types of devices need to be connected to an Ultra HD TV that meets HDCP 2.2 content protection standards.
-- Samsung Ultra HD TVs (2014 models or later)
-- Sony Ultra HD TVs (2014 models or later)
-- LG Ultra HD TVs (2014 models or later)
-- Vizio Ultra HD TVs (2014 models or later)
We're working hard to expand our Amazon Video service to a broader selection of Ultra HD devices.
If you try to play Ultra HD content on an unsupported device, Amazon Video will play back in HD video quality.
To stream videos in Ultra High Definition (UHD), you need a high-speed Internet connection of at least 15 Mbps.
Fluctuations in your connection speed can cause buffering or changes in video quality while you're streaming a Ultra HD videos. Restarting your device, modem, and/or router often helps with issues like this. If your connection speed is a lot slower than usual (and you've already tried restarting your device, modem, and/or router), you might need to contact your Internet Service Provider (ISP) for additional help.
If you don't currently have enough bandwidth for Ultra HD streaming, the Amazon Video player automatically adjusts to deliver the best video quality your Internet connection can support.
After performing the above steps, please try to watch the video again.
Okay.i have neither the newest Roku or 2nd generation fire stick...I take this to mean I am SOL for the present...am I right?