Just support EmuNAND V9.2.0,not system firmware . =( ,see this thread : http://www.modchipwarehouse.com/news/mtcard-hardware-v22-released-to-support-emunand-v920-a-76.html
K3DS need use disk writer to flash games as well,see this blog guide : http://www.modchipwarehouse.com/blog/user-guide-how-to-use-k3ds-play-3ds-games-on-n3dsxl-v9-2-0-20/