I have updated the firmware on my Deco to 1.1.6. The descriptive text did not mention a change to the parental controls (this change is now mentioned in the firmware update to 1.1.7) and yet now I need a subscription to be able to use them. Given this was the primary reason for buying the system for me, I am now very frustrated. 

What can I do to get back to the previous parental control?

I have no wish to subscribe, as this incurs additional cost.