It's as Yepi69 says, but I'll clarify a bit.
Gateway works thanks to a certain exploit in the DS profile on the 3DS. You need to install a hack to make use of this exploit and boot up Gateway.
Any time you start up DS mode (by playing a DS game or using a DS flashcard), the hack will be removed and need to be reinstalled.
just for feed my knowledge.
that does happen with the gateway DS MODE (blue) card? if you play a ds rom using the gateway card, will you need to re-apply the patch?
when installed Gateway and started Gateway 3DS mode,i still don't have one, and i think would be sorta waste if is not possible, ty
No, DS mode flashcard will boot from gateway mode.so.. just don't boot Gateway mode, and Flashcarts will work?