I have exactly the same problem as Maurice, with my OLED808 and an Apple TV 4K. The “Optimal” setting is not remembered, resulting in Dolby Vision being disabled as an option on the Apple TV.
It’s infuriating that one of the premier features of this TV (Dolby Vision playback) is not possible without constantly reapplying this setting (even considering that you have to know that this is a setting – I assume most normal owners of these TVs don’t).
Let’s see to what extend this problem might be fixed with this firmware update.
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