Uninstall SuperSu with binaries

I have Cyanogenmod 14.1 installed on my Samsung SM-G900f. After installing SuperSu from Phillz recovery, Wifi try to start, but no success. I found the same post here https://android.stackexchange.com/questions/161353/wifi-doesnt-work-when-supersu-2-72-binaries-are-installed-on-android-7?newreg=a413e9de1352448cb64d9d4b2b60aa3c The last comment sugest to "Better you uninstall SuperSu app and binaries and use CM's Default Root Access (from Developer Settings) till the issue is fixed" I've tried to uninstall SuperSu the normal way and from the app settings: SuperSu > Settings > Switch superuser app, but when SuperSu is uninstalled and in the CM settings the root access is set to disabled, it is ignored and every app that granted root permission from SuperSu before, seems it has it now and use it without asking. Root access from CM settings is ignored. That being said, how can I uninstall SuperSu app and binaries and use CM's Default Root Access? Or even better, is there a fix to a non working Wifi?