It will be mib1 Mapcare that stops all of the identical cards from working across the brand. You have to go up the thread for someone wanting to be a guinea pig to trying what a dealer said.
Basically the map updates are all identical across brands, interchangeable, it's Mapcare built into the firmware of the units that prevents you from doing a straight update. Well the code dongle things that control what your unit can do. Firmware checks for that being set. Mapcare is on there.
These FEC / Swap codes
http://forum.obdeleven.com/thread/6082/fec-swap-codes-list-mib
You haven't got the code you don't get in. That's how people get stuck with their firmware updates since they don't have the license for additional aspects of functionality.
Mib2 standard we have a workaround which is a software fix, mib1 standard one dealer somewhere who says yes it's possible on the thread, probably not true. Just the card from them. I did report back in 2016 some people had success with updates others didnt, but those are one off updates. Here I think there are two types of mib1 cards, dealer ones and DIY ones. Need the part number to pin any success down which is what I said above. That dealer had claimed there after you could do the updates yourself.
Mib2 plus / High without Mapcare you get it turned into a retrofit by a specialist if you want to do map updates yourself like Mapcare - it's a feature of retrofit although I did have someone who had an Audi one that they couldn't do map updates contact me - so not all retrofits clearly allow you to update the maps. A retrofitter needs ODIS to access the central VAG computers to register changes, if they dont have ODIS they cant do the work. The one in the Midlands does "retrofit" work but doesn't have ODIS login so cant do map work - they told me that. That's for Mib2. I've had my Mib2 plus / high turned into a retrofit after Walone on this board had his done - Croyden based outfit that does have access to ODIS.
Several years back a guy from Slovenia or Slovakia appeared on the big Seat Navigation thread saying he could do it for a price on mib1 standard so the maps could be updated, just send him your £800 unit, price not published. No takers to my knowledge, but people said just say how, he said too technical. Now whether retrofitter in the UK could do it, never asked since I don't have mib1 standard. The Croydon based outfit could be a good start. Basically they deploy well known retrofit solutions developed in the east. So they might have the Slovenia / Slovakia guys technical fix which he got from somewhere. Somebody needs to phone them up who really wants to update their maps or follow up that dealer on the thread who promised a card that could do everything
. Those ebay sellers of 2016 I reckon.