Ohh gosh...
The article from DSTWO site frighten me.
I really thought that most of the flashcards are dead now but I don't think so right now.
There are 3 flashcards that works fine on the new firmware.
Its just like all others updates.
Nothing MAJOR that can't be fixed with software update of flashcards.
Just wait for update from your card.
Nothing uncrackable.
Problem is that this 3 working carts are problably the only ones that will work after this firmware update. Those 3 could only use a software update because their hardware allowed them too, the other carts doesn't have a hardware that allow them to update in a way they'll work on this firmware, so they are permanently blocked.
EDIT: To give a better explanation, there are differences in the hardware of many flashcarts, for some reason those 3 decided to use a desing where they have a rewritable Save IC, any cart that doesn't have that can't do any software update at all to work this firmware.