Which exploit?No.
You could do that flashcart thingy or since he's on 11.4 install CFW for him.
Here you go.Yes, you can use DSiWareHaX to get CFW on your friends console. You'll need to purchase a legitimate DSiWare title and use the save injection on any compatible title. The guide linked above explains everything I just can't link the exact page from my mobile.
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