Hi I realise this is an old thread. If we were to update to version 5 of SZ software, would we still be able to use the older firmware that will run 7372 at the same time? From what I'm reading here about only going back 4 versions, is that a restriction on how many updates or is it literally based on the version number alone. EG: If I were to go straight from 3.5 up to 5 skipping any intermediate versions would it allow me, or the second I go to 5 would anything <4.5 (if 4.5 exists?!) stop working