My unit was originally 5F0035020A, Hardware H42, software 0319.
I had to update the software in 4 stages, SW_0674 then SW_0818 then SW_0897 (same as yours) then finally SW_1219.
Each software update changes the suffix letter (in your case 'D') to one higher in the alphabet, mine went from A to F in think it was.
When updating the software it gives errors when scanned with VCDS or OBD11 Pro but these can be solved.
Personally if everything is working ok with your software I would not go to SW_1219 (I don't know what if anything the update improves).
Have sent you a message.Is there a way you can tell me how to become these updates ?
Mine is Hardware H42 and indeed software 0319>
Hope to hear from you
If it's the standard mib2 which uses an SD card, no best to get Seat to install the map card. If it's through a dealership it should be supplied. After that the "workaround" is available for map updates. Often the card supplied is out of date so you'd update it yourself once a working version us installed. If the unit has been married up to a card in the past the dealer needs to remarry it to a new card. Its only if its never been married up can you put a card in it yourself - least as I understand it. That's how dealers send people cards and they work.
I'm not up to speed with what the options were on 66' plate Leon FR tech. I'm assuming it's the standard mib2 and not cut down colour thingy as posted above. If you got a box in the glove box that's a proper navigation unit. Doubt it would be a plus and the maps are on an SSD in any case.