Yes you can reflash. Don't reboot until you install SuperSU. So root with kingo, install KingoRoot then uninstall KingoRoot.supersu, then install SuperSU and update the binary with normal method. It will fail, just tap reboot.
Sent from my Samsung Galaxy S4 using XDA Labs
The first time i used the latest version of SuperSU instead of the one linked in the tutorial. This time it seems to work.
Thank you and the OP so much!