A:AnswerFor a list of devices that support the Echo Home Theater setup, please visit https://www.amazon.com/gp/help/customer/display.html?nodeId=GYYMWGZJUK28FEN6
A:AnswerMake sure your Roku device is 4K and that the content you are trying to watch is 4K as well. For product support, please visit https://www.insigniaproducts.com/email-us
A:AnswerYou can say "Go to NBC".
Please visit https://www.amazon.com/gp/help/customer/display.html?nodeId=202174250 for a list of Alexa commands to control your Fire TV.
A:AnswerWell if your trying to install an app you need an account .Also either on android device you will need a GMAIL ACCOUNT .to install an app. But there's alternative ways to install apps with a software named AS LINK.