I need to know how to set my application as Device owner in Android 5.0, 4.4 and 4.3(?). I've yet tried the method for rooted devices ([described in there](https://stackoverflow.com/questions/21183328/how-to-make-my-app-a-device-owner)), successfully. I saw that works great in android 5.0 and 4.4.2 emulator and in CyanoGen AOSP 4.4.4 (all rooted devices). But I must need to try this on other non rooted devices, in Android 5.0 Developer API you can read this 

> 
> "To deploy and activate a device owner, you must perform an NFC data
>  transfer from a programming app to the device while the device is in
>  its unprovisioned state."
> 
> 
> 

but I don't understand what it means, or better, what I've to do. Can someone help me, or explain me the step to do?

PS. I know what NFC is and how it works but I can't understand how to use for this issue.