A:AnswerUnlock the developer options by going into device settings. Click on "about device". Then where you see "build", you click on that 7 times.
Then you'll be able to access the developer options and force update the firmware etc or just USB install the image.
A:AnswerNo, the Only thing that does is Apple tv but it doesnt even support the full feature list of HDMI 2.1 i belevie only color, not refresh rate ect