There aren't any exploits that work on firmware 9.3 or above. You can use a Sky3DS card on any firmware, but you won't be able to install cias - no dlc, homebrew, region free, among other things.
There's gbaemu4ds which will work on any DS-mode flashcart but it's far from perfect, sound quality is bad and not all games work. It is fullspeed though.
The DSTWO's GBA emulation is better.