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

ROKU and 120htz Refresh Rate

Not sure if this is the right location for this thread, but here it is. I have a Vizio V704-H1 tv that refreshes at 120 hz. I have a ROKU Ultra LT box. When I connect my ROKU to the TV, it is recognized as the TV automatically assigns HDMI Input 1 as ROKU,but I have no picture or sound. I had to hook my Ultra LT to another TV to change the settings to 4K 60hz, and reconnect it to the Vizio. This still did not work. Is the problem the Ultra LT? Would the ROKU Ultra work for 120hz? Or does ROKU not have a unit that refreshes at 120hz?

Thank you for your time. 

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