Updating maps on 2017 e220

I am trying to get updated maps on an 2017 E-Class but i'm not really sure what will actually work. I've tried to download the update to usb as per "MBRetrofit" but it didn't ask for a pin so i don't think this route is viable. Do i have to buy a new card from somewhere like navi-world? they have a few cards that /might/ work but nothing that i'm sure about. I'll paste the vin in the hopes that someone can either tell me a better way or give the go ahead.

Vin: WDD2132051A329600