At my previous 2 services I was offered an update to the Infotainment system (think it was 91U4) which I declined as it would have removed my 'Mods'.
I've never been offered any on the infotainment system but I always say, that ones not the infotainment system is it ?, they say no. Think you are on the one before 1447 so perhaps they are offering you 1447 and if you had AIO you have the mods. What you don't really know is whether their records are up to date or whether the system when plugged in determines they can improve on what you have in their terms.
There was a German case I read on the Digital Eliteboard board where a guy bought a second hand car, was told by it's owner it had it's infotainment unit modded and
how to update the maps, he couldnt update the maps, probably the map Mac issue and not knowing he needed to use CleanMyDrive on the SD drive after unzipping. Could have been the FeC issue like our retrofitter's poor handy work e.g.. not life long navigation FeC but set short to get extra work so the maps wouldn't load, one of the two. Took it to a dealer. Told them, so they returned it back to how it was factory supplied without the maps working (not how it was supplied). He wanted to know
how to restore the mod. The dealer probably didn't know they had to restore the original map release if they were going to do that to fully restore it in a working condition with old maps. Dealers aren't software engineers. Mind you probably only a German dealer would embark on this, a rules based solution
.. which made it worse.
My old Essex dealer was quite understanding that people mod the infotainment unit and wasn't interested. Similar here. I was going to say only mib2 high units would suffer from this issue but a mib2 standard where they had used a retrofitter to mod the firmware for the map update rather than use the workaround would have the same issue I guess, hinges on whether the FeCs get returned to the factory setting on any firmware update. The German one described above they did, normally it shouldn't happen that a firmware update alters the FeCs, only if they alter the FeCs would this happen as part of a firmware update, normal infotainment firmware update does not touch the FeCs. The navigation FeCs stand outside of a firmware update. Think this was part of the hocum our old retrofitter gave us to secure repeat business.