BlackBerry Passport supports microSD cards up to 128GB. microSDXC cards can also be used with it. However, BlackBerry 10 recognises only FAT formatted external partitions and these cards comes mostly with ExFAT. So the device will show that the media card is not supported and is downloading drivers, but it will fail with an error. To fix this, erase the card and choose FAT as the partition format. Then the OS will recognise the microSDXC card.