Before starting :
You can use terminal from PS or using adb shell from computer
Download and unzip “Replace_Kingroot_With_SuperSU.zip
Send the extracted folder “mrw” to the internal storage of your device and make sure that this folder contains 4 files
Open shell and type :
“Su” (without “”)
Allow root permission
” sh /sdcard/mrw/root.sh” (without “” , notice there’s space between sh /sdcard.)
It might display some error, but wait for 30-40 seconds and at the end it will launch supersu or open supersu manually.
Update su binary normal, then reboot.