I installed TWiLight Menu++ both on my New 3DS XL and my DSTwo Flashcard successfully.
Furthermore, I copied the "Flaschard Loader" and "Autoboot" files to my flashcard.
When enabling the "Auto-start Slot-1", my system's TWiLight Menu++ won't boot up anymore and instead show a white screen.
However, booting up my system's "TWiLight Menu++" with "Auto-start Slot-1" works as expected - starting Slot1 from there manually works and I can see both my system's SD card and my flashcard's SD card.
Thanks for helping me out
Furthermore, I copied the "Flaschard Loader" and "Autoboot" files to my flashcard.
When enabling the "Auto-start Slot-1", my system's TWiLight Menu++ won't boot up anymore and instead show a white screen.
However, booting up my system's "TWiLight Menu++" with "Auto-start Slot-1" works as expected - starting Slot1 from there manually works and I can see both my system's SD card and my flashcard's SD card.
Thanks for helping me out