A moderator moved your post to the correct forum
(you originally posted in the WDTV Media Player forum which is the 2014 version which does not support Netflix)
Anyways …
For Miracast to be available on the WDTV Live Streaming you need Firmware 2.02.32 or Higher
(it was added in 2.02.32 [see release notes below] … Miracast is NOT available on FW 2.01.86)
AFAIK Netflix is still supported on the WDTV Live Streaming no matter which Firmware you are using.
Maybe try the Latest Firmware ? 2.03.20
