Hacking Help recovering 3ds saves

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I have an old sd card with saves on it. When I insert this card into my 3ds it does not recognize it as valid, and it deletes all of the contents in Nintendo 3DS. I made a backup before I inserted the sd card into the 3ds just in case this happened.

I would really like to recover these save files. Is there a way to decrypt the contents of the nintendo 3ds folder?

Thanks.

EDIT:
I hotswapped my sd card and was able to extract my saves using JKSM. Thanks for anyone who looked into this. I've resolved my issue.