Steps ↓
1. Go to your phone settings ☞ About ☞ Software Info
2. Tap the build number 5-7 times until you see "You are now a developer".
3. Go to http://kingroot.net/ on your android device ☞ click "Free Download"
4. Make sure "Unknown Sources" is ticket on your security settings
5. Open Kingroot and click "Try it"
6. Let kingroot root your device
7. Done!