Make sure the source device is officially Miracast-certified. You may check from the below the link provided by Wi-Fi Alliance.
www.wi-fi.org
Make sure Miracast is enabled on the Miracast source device (refer to the user manual of the source device)
Make sure Miracast is enabled on the Blu-ray Player
Steps as follows:
Press [Home] > [Network] > [Miracast] > [On]
Make sure the player is in Home menu and is not playing any disc
You can either set the Miracast Role to Auto or Group Owner
Steps as follows:
or
[Auto]: The role of Group owner is automatically determined between the source device and this player when connection is established.
[Group Owner]: Force this player to be the Group Owner and allow it to select the channel to use for establishing the link with the source device.