Issue with DSTT
To be blunt, if I boot my DSi with my DSTT inserted, it would boot the DSTT after the hiyaCFW splash screen, skipping the DSi menu. Interestingly enough, the DSTT also doesn't load the menu, and is stuck on the loading SD screen. I'm using version 1.3.1.
Not sure if this extra info isn't needed, but 'Autoboot title' is off and doesn't happen with my R4i Gold 3DS.
Do you have TTMenu.dat on the flashcard's SD root?
I probably should've added that it works when I use it via NTR Launcher on my 3DS. I've even tried the DSTT via NTR Launcher on the DSi and it's the same issue there.
Edit: To answer your question, yes, it's on the SD card.