Good news! A friend offered me an old NAND extraction! So I'll be fine if I need to use the Raspberry Pi method.
In the meantime, I still haven't had time to update my 3DS, is that still a good idea? And would that affect my 3DS, or should it be fine?
Afaik, you can't use another system's NAND on yours. They are unique. There would be no hard bricks if we could do that.
And what do you mean by update? Don't you have BlackSOD?
But I'm interested in the Raspberry Pi part. Are you following a tutorial to do that?