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by pseudosavant 6 days ago
It is pretty easy to make a Roku TV dumb.

1. Remove the few pre-installed apps except the HDMI inputs you want.

2. Then disconnect wifi.

As long as the device you turn on does HDMI-CEC (which almost everything other than a PC does) it will automatically switch to the input that your device is connected to. If it doesn't, you just have to click on the input you want to switch to.