 Phone must be rooted!
If the software can't root the phone automatically, 
then you must root your device manually.
1. Power on the phone.
2. Enable "USB debugging" in "Settings"-"Developer options" for Android 4.0 - 4.1.2 or
   tap 7 times on "Build number" in "Settings"-"About phone" to enable "Developer options" in Android 4.2+.
3. Connect the phone to PC with USB cable, install drivers if needed.
4. Select device in ADB settings.
5. Press "Unlock" button for direct unlock.