Just follow this steps:
1: change /system/etc/wfdconfig.xml
<ContentProtection>
<Valid>1</Valid>
to
<ContentProtection>
<Valid>0</Valid>
2. add below line in /system/build.prop
persist.debug.wfd.appmonitoring=1
3. restart the phone
~Is New version support 4.4 KK?
>For actually we don't test it on 4.4 rom as we think most of the users are went to LP already.of course you can test it if you have made a backup before