I played the test HDR clip from Life of Pi on my 55x8005c and it appears to switch to HDR mode. The picture looks good and I lose access to all picture controls. If I try change brightness or enter advanced settings it says feature not available. Is this normal behaviour for HDR content played back from a USB stick? Everything I can find says this model doesn't have HDR and I don't have my mention of HDR in picture settings but something seems to happen when playing this demo.