My C61K shows 0xa35. My HR54 is on 0xff3. I'm guessing my C61K needs to be updated to 0xFB7? How do I get that update on my C61K? Thanks again for all the replies.
What version does you C61K show?
I had 0xFB7 (and still do) on my C61K mini's and had the same issue but my Genie was still running 0xD80 but once I got 0xFF3 on the Genie everything became consistent on the new GUI and I could then run the HDR test. My C61K is also connected to a 2016 LG OLED C6. Also that test will only work on the C61K (just to be sure you are not trying it on the HR54 Genie which is not capable of 4K or HDR) and you must also of course have 4K enabled on it as well.
If yours has the same updates I'm not sure why it would not work. ??