I had to enable the beta firmware option, which installed firmware 210202_1854_r17.
This enabled the 'LG Amaze' demo to display in Dobly Vision, however I've only found one other file that plays in Dolby Vision in my collection (mixture of .mp4 & .ts single layer, .mkv dual layer).
And some of the files that play in HDR are very stuttery.
Early days
.