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"-"Applications"-"Development" for Android 2.x or
 "Settings"-"Developer options" for Android 4.x.
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.