Hey there,
maybe it's a bug or an operator error. I can't change the ILS Frequency und RAD/NAv prior I loaded a simbrief plan. So when I got directed to an nother runway its not possible to enter the correct and changed ILS Frequence, nothing happens. I can typ it in the fmc but i never update. Tried with LROP (Barelli) and yesterday the same happened with changing from RW 13 to RWY 31R ILS Y in LFML (BMW). Maybe you can shed some light in here or I missed the correct procedures for entering a different ILS.
Regards
Michael