To root an Android device running version 6.0.1 (Marshmallow) using KingRoot, you can use either the mobile app or a PC-based software. Important Precautions
If you choose to proceed with KingRoot on an older device, follow these steps: Enable Unknown Sources Unknown Sources to allow installation of apps from outside the Play Store. Download the APK kingroot android 601 install
If the APK fails, use the Windows tool:
If KingRoot fails or feels too risky, consider these superior options for Android 6.0.1: To root an Android device running version 6