I did not do anything to the phone it self its all factory OS and NON root or bootloader unlocked.

I am using factory UI there is NO special software installed at all except my movie and tv show programs.



I have every App that is installed from factory still there but disabled if it can bee and also all data running in background for every app turned off as well .

It took a while to set every app data setting but its much more efficient on the battery mine lasts for a couple days with out recharge.



As for the phone display being on I have NOT found a setting anywhere that I could turn it off and the other question.



NO I HAVE NOT AT ANYTIME GOTTEN THE ERROR not supported THE TV I USED DOES NOT HAVE MIRACAST ITS JUST A 42 INCH WESTINGHOUSE TV I BOUGHT FROM MICRO CENTER A FEW MONTHS AGO ( ITS NOT A SMART TV )



I think maybe the error you might be getting might have something to do with the type of adapter you are trying to use ( just a thought ).

the adapter i am using does NOT have any markings on it of any kind to tell me what model # it might be . |BUT I did post to the person where I bought it from in an earlier posting.