A:AnswerThere is an option to allow the installation of applications that are not from Appstore, this option is used only to install apps from reliable sources as a developer.
A:AnswerTry the Power On feature, when enabled, your TV turns on displaying the last used input: go Home > Settings > Display & Sounds > Power On and select Last Input.
A:AnswerYes, you can connect your Roku stick to one of the HDMI inputs on the TV.
Try the Power On feature, when enabled, the TV turns on displaying the last used input. To activate it, go Home > Settings > Display & Sounds > Power On and select Last Input.