Google dropped support for Miracast with Marshmallow onward: https://en.wikipedia.org/wiki/Miracast#Android
Were you trying link up your ZTE to your LG TV using specifically Miracast because you don't have any WiFi connectivity? Or if you do, did you just want to mirror your ZTE to your TV in general?
If the former you might want to just buy a basic wireless router and set up your own home LAN so you can connect your ZTE and LG TV together over WiFi (online connectivity is only required when you need to access the Internet, any typical off-the-shelf router will allow you to set up a LAN with or without it).
If the latter, try using the Google Home app on your ZTE to mirror it over to your TV.
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