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It could be any one of the items you mention. If you just purchased the SD card from the dealer I would go back to the dealer. You have a 2018 GLA so it has a warranty and if it is the Audio 20 problem they should fix it. The dealer should make the SD card good if it is the problem. If you purchase the SD card online contact the seller. If all fails you might try downloading Mercedes Download Manager and run it. It will update the firmware and update the maps. Firmware updates in minutes and maps in hours depending on WIFI speeds.
 
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