FYI, new Arm11 exploit is released. You can downgrade 10.6 consoles without a nand mod now. So there's no risk in just updating back via safe mode if things go south.
Also, what DS flashcard were you using with your DS Lite. You might be able to use it on your 3DS now with all the advances in TWL_FIRM patches and special launchers.
The DS flashcart I have been using is an R4, not too sure if genuine or fake. Anyways, it's pretty screwed anyways, the only way my DS would read the card properly was to stick a piece of paper behind it to "bump up" the card.