Modify Attributes

I have a universal media player with a firetv and an emby device

I want to change some of the attributes of the universal media player, the entity_picture or the media_title for example.

Curious if you have succeed in changing the attributes for universal player. I’ve tried without any success for the the attributes.

Have not had much luck with that.

I looked into the code and it seems like only few attributes are set to be overridden, media_title is not one of them for some very odd reason.