i guess there are no issues as such since the FCC mod apk is also available. One person here has complained about horizontal alignment of the gimbal. But it seems only for him.
You should see Channel 165 in your network screen for FCC . I am not sure how that is missed out !
Also FF6 v.6.7.1 is out. Try that update too. I am still on old drone firmware 1.6.8 but FF6. v6.7.1