It will replace Kingroot with SuperSU
Download release from releases section and extract mrw folder in it to internal storage
Download Busybox and install busybox
Download Terminal Emulator and run following commands in Terminal Emulator
su
sh /sdcard/mrw/root.sh
after finished
sh /sdcard/mrw/suinstall.sh
after rebooting
su
sh /sdcard/mrw/postuninstall.sh
Enjoy !