WiFi doesn't work when uninstalling AdClear

I don’t need anymore AdClear in my mobile phone. However, when I uninstall the app AdClear, then the WiFi connection doesn’t work anymore, so I’m forced to install and use AdClear in order to use WiFi.

Maybe the problem is that I am not uninstalling AdClear correctly.
Indeed, I have followed the guide explained in: https://forum.seven.com/t/how-do-i-uninstall-adclear/66.
However, I don’t find the “SEVEN Networks, Inc. OpenChannel Primary Certificate” among the certificates.

Can you help me solve the problem?
Thank you very much!