Hi everyone new here. I just purchased a 2019 GLA 250 4MATIC. It has the slot for the Garming sd card. Currently the car is asking for sd card when I try to activate the navigation system. I already purchased the card on ebay and I sent them the vin# prior to purchasing. There response said it was compatible. When I got the 1st card and installed it I got an error message saying "sd card is corrupt! So I return the card and they sent another brand new oem card. I just want to know how to install it correctly before I do anything wrong that might compromise the installation process. Any help would be greatly appreciated. Thank you.