Mmi 3g basic map update 2020-2021

I’m wondering if the map update 2019-20 I have downloaded from mega is giving problems with the activator. Am I right in thinking that the activator is for hnav and not bnav? My reason for asking is because I’m wondering to go for the 2021-22 instead as that has the fsc and activator included. Does my current maps need to be updated before going for the 2021-22 in one jump or do I need to update in increments.
many thanks in advance