A:AnswerThe USB port is designed to for firmware updates. Various files may or may not work in the port but it is not designed to be a media reader. Thanks -Randal
A:AnswerThe SmartCast app requires android 4.4 or higher but to cast content to the display you would need to check with the individual app developers. For Instance Netflix may require a different version to cast than Vudu or hulu.
A:AnswerYou can find the specifications needed to have this TV wall mounted from the User Manual for this product, or it's support page. For actual directions in wall mounting the TV please refer to the instructions included with your wall mount.