I think I really screwed up. Vivid Support got access to this computer and made some "changes". How difficult will it be to fix the mess?

Hi all, i have to migrade a customer from UTM Endpoint Protection to the good old Enpoint Standard with EC ... EP 10.3 EC: 5.3.0 Here is what i've done yet: 1- Install EC und configure updates etc. (GPO, FW def and stuff which is important…