It didn't took too long.
SC just released a new firmware that support both DSi 1.44 and the latest 3DS 18.104.22.168!
The SuperCard team, just released a new Firmware version for their DSTWO. v1.15 is now compatible with both DSi 1.44 and the new 3DS 22.214.171.124, which was just released yesterday.
Here are the upgrade instructions:
Download it on the official SC website linked below!
OFFICIAL SITE: http://eng.supercard.sc/manual/dstwo/download.htm
NEWS SOURCE: http://www.gbarl.it/index.php?showtopic=82269
Our thanks to 'Gauss' for this 'flashcart' news update!