@PaulKeepsItReal, on a Roku TV the System Restart is under the Power settings. You can always just unplug the power from a TV to restart it. I suspect people updating to the same OS version aren't doing anything other than a system restart.
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We just had the same problem — the time was 90 minutes off and our channel menu was mostly blank—and fortunately unplugging the Roku box from power and plugging it back in solved the issue. It fixed the time and our channels are back. 🤷🏻♀️