I tried to root my Galaxy Core 2 Duos using Kingo root, which installed SuperSU. Unfortunately rooting failed all of a sudden, but still SuperSU remains.
How can I remove SuperSU from my device?
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You should simply just be able to uninstall SuperSU as you would any app via your apps viewer. If I were you I would avoid using KingoRoot, I have heard some poor rumors about it. Try Re-rooting the device using something like towelroot, afterwords you would then install SuperSU from the appstore, allowing you to give apps superuser permission.