Product Code Help

I'm having a similar issue as a recent post.
I purchased a Katsukity N3DSXL from a seller and everything works except I need a product key after a graphics card upgrade. Since it wasn't purchased through your store can I request a new key as well?
Its running new3DSview ver113_r2
I purchased a Katsukity N3DSXL from a seller and everything works except I need a product key after a graphics card upgrade. Since it wasn't purchased through your store can I request a new key as well?
Its running new3DSview ver113_r2