My son signed up for the public beta of iOS10 and decided he didn't want to try it out yet. He un-enrolled in the beta program but it still shows in the upgrade screen. He never actually installed any of the iOS10 betas but now it won't go away and it doesn't show him the upgrade to 9.3.5 that came out yesterday. He is currently running 9.3.4. Does anyone know how to get rid of the beta install that is showing? Thanks!