We're running 4.2 and super with 4 tiu. I put one of our remotes out of seven back to 3.1 and the scrolling issues disappeared with the one remote. Yes a 3.1 remote works with a tiu 4.2. All that whining from me over the last couple of years and the solution was there all the time. Who knew??? not me. now if we need the recover engine feature just use one of the others with 4.2. I would guess the scrolling is definitely a remote issue.