Handware: Ace3DS X has a switch for 3DS mode and DS mode
3DS mode-NTRBOOT flashed FLASHCARD. Ace3DS X has been pre-flashcards NTRBOOT and supports installing boot9strap on all 3DS consoles models & versions
The using method of Ace3DS X is a little different from other flashcards, and you need to insert one FAT32 microSD card(maximum capacity is 32GB) to your flashcard
The other steps of using Ace3DS X are the same as other flashcards. Follow the Installing boot9strap (ntrboot) instruction in 3ds.guide.