How to unroot phone?

Hi guys, I am getting tired of not being able to use several banking apps, and therefore would like to unroot the phone. I've tried several hide my root apps, including RootCload and xpsosed framework without success. Would be grateful if anyone could help me to do a perm unroot. I've tried the full unroot functionality in SuperSU, but that doesn't seem to work. Are there any ADB commands or any files I can flash in order to unroot? Btw, running CyanogenMod 13 st. of Sept version.

All help greatly appreciated.

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