So how does this update work?

[DatDutchGuy7]

Does it attach to your cardridge? And if so, can you delete it by using the deletion method displayed in the manual, or is it attached to your SD card/System?

Can you undo it?

 

[Gabi<3AnimalCrossing]

All it is is a free download from eshop and it goes to your sd card!
And I dont think you can undo the update.