Hopefully this post makes its way to the right people.
KINGO 1.1.6, download that. On your phone, dial *#0808# and select ADB DM MODEM option at the bottom. Then attempt to root. It appears Kingo has issues with MTP/ADB mode and is very tempermental. This should work.
KINGO 1.1.6, download that. On your phone, dial *#0808# and select ADB DM MODEM option at the bottom. Then attempt to root. It appears Kingo has issues with MTP/ADB mode and is very tempermental. This should work.