Hi,
I've successfully upgraded my XR500 to this firmware version following all the steps. I've performed factory reset. I have an issue. My Sony TV (running Android) streaming has been really poor since I upgraded - it buffers BBC iPlayer - sometimes it doesn't even load the app or gets stuck signing in and displays an error. Same with other streaming apps like Netflix on the TV. Netflix would load and I could browse the library but it wouldn't stream. I tried many different features on and off - it's network is wired and connected directly to the XR500. I also tried Wifi and the same result. I found the problem is Adblocker. I disable Adblocker - reload iPlayer and it can stream UHD content I can see 20Mbps download in the network monitor - you can see video quality is great and no buffering. Turn Adblocker back on again and network monitor shows it starts to drop down to 1-2Mbps and starts dropping the video quality and buffering again. Disable Adblocker and it's back to normal again after reloading the app. It's not QoS. I tried that on and off. It's definitely Adblocker. I noticed a couple of Tracker domains blocked which I whitelisted - but it doesn't seem to help. It just seems to reduce the available bandwidth when it's streaming video. Hope it helps some people and you're able to look into a fix because I really did like Adblocker when I was browsing web sites - it definitely helped reduce the ads on some of the sites.
Cheers.