Even so, most stores (EB, GameStop, etc.) will replace the system for you (if they don't inspect it superclosely, that is) as long as you have the warranty receipt. When I voided the warranty of my first DS my attempting to install FlashMe, I got it replaced free of charge with no questions asked. All I had to do was show them my receipt. And yes, once you buy a system, it is yours. flock with it all you like. The only thing you dont wanna void the warranty for is a PC. I need to get my hands on a DS soon. Flash cards sound really fun.