I was under FlyMe 4.5.7A then I moved to the Beta 18.104.22.168 keeping my data and settings.
I do not know if you noticed but I did some test: if you have not before Mx4 rooter in 4.5.7A and preserve settings when switching to root BETA disappears and it is impossible (well I have not successful) to find , it is not in the security section .
I wanted moved on to other higher BETA version than 22.214.171.124 .
But hop over root it disappeared again keeping the same data! If you have an idea for the rooter otherwise it 'll help me a lot !