Managed to complete the guide, except I never removed ntrboot, as it wasn't working. Left it as the guide says it was optional. How do I go about getting games onto the DS (not the games themselves, but get them playable etc.)?
So i'll try + clear up I guess.
I have both the flashcart sd + the device sd in the DS.
On the flashcart SD there's the ntrboot flasher thing (ak2i_ntrcardhax_flasher_dsi.nds) and the flashcart firmware.
On the device SD, there's everything else.
I flashed ntrboot but b9s wasn't working, I had put the files on flashcart sd card when they should've been on the device sd. Which I think is what's messed up the flashcart.