WUUK Smart Doorbell only works with an SD card no larger than 64GB and it needs to be Class 10 level.
After you insert a new, supported size SD card into the chime, if it does not work properly, do the card formatting via the WUUK app.
Dashboard -> the Gear icon next to your doorbell's name ->SD card
When press on the SD card option, it will give you an option to do formatting.
Plus, if the problem remains, try to connect the SD card to a laptop to check if the card can be recognized. And it's suggested to format the SD card into FAT32.
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