Roku Device Features, Settings & Updates

Help configuring Roku device settings, using Roku OS features such as screen mirroring, adjusting display type and audio settings, using Guest Mode, and assistance with software updates.
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Level 7

Dolby Vision 30hz Ultra

Very disappointed that leaving many of us behind....why would Roku do this and not have Dolby Vision 30 hz option as in the past....fix this please....upgraded and now regretting