On the Hi8, Miracast appears only to work in Android.
To enable:
Go to Settings – Display – Cast Screen
You will probably see “no nearby devices were found”
Press the “3 vertical dots” settings icon in the top right of the screen (under the Battery & Time indicators).
This will give you the option to “Enable Wireless Display”
You should then be able to see available displays to connect to.
NOTE: Miracast/WiDi does not work in Windows. The Intel graphics chip does not appear to support WiDi (tried the Intel WiDi update tool and it failed). I could only get DLNA to work to a TV via WIFI.