I created a post about how I wondered if my Cyclos Ds flash cart would work on my CFW 3ds. This is the response I got.
I installed the .cia of "twl slot 1 launcher", but when I have my card in and run the program it tells me that an error has occurred and that I need to shut down my system. Can anyone help?
IIRC, the CyclosDS had a header. Which means that it should work with this application
https://gbatemp.net/threads/twl-slot-1-launcher-first-custom-dsiware-app.414501/
You do need a CFW for this application to work. Without a CFW, you can't get your card to work on the 3DS.
I installed the .cia of "twl slot 1 launcher", but when I have my card in and run the program it tells me that an error has occurred and that I need to shut down my system. Can anyone help?