Disclaimer:
Prior to Utilizing SDCard ensure you have formatting to FAT32.
and upgrade to most current firmware on your DS.
All the best.
Link 1: https://drive.google.com/file/d/1oFBGZrGW1RJuI-bEvcyGY7KwEXj_pxkn/view?usp=sharing
Link 2:
https://www.solidfiles.com/v/e6G63AGzXgYpm