The Cast can be obtained from the YouTube App, for example, or from a Smartphone (even duplicating the screen and not only sending a content but this if it is Android). Mirroring, which AG9 does not have, is screen duplication but is not used by Apple anyway. The problem of Wi-Fi and Ethernet doesn't have to be there, to use the TV via LAN and the Smartphone via WLAN and send anyway (same network in fact).