I've just updated to 1239 firmware on my KS9500. I have a Roku+ and wonder if there is any way to test the HLG, given we don't have Sky HLG yet in the UK?
Use a websocket client to see if the Sky Q box sees an HLG enabled TV. In a websocket client, type ws://192.168.0.xx:9006/as/system/status where 192.168.0.xx is the IP address of the Sky Q box
Should see an HDMI section like this - so just check if "SinkHLG is true.
So i've just installed FW1239 on my KS7000 and checked the Sky Q box using the websocket client and I can confirm:
We finally got the fix! Just need Sky to launch HDR now!