but why does dstwo work with it ( saw it on youtube ) and gateway not? thats serious shit... spend 70€ and now its not working, the website should have made it clear that 7.1 is not the 3ds firmware support
Because it's a whole different flashcard. The Gateway uses an exploit in the DS Mode to get access to the 3DS Mode. This exploit wasn't patched until 7.0, however, even though the exploit was still there you couldn't access the 3DS Mode in firmwares bigger than 4.5. The DSTWO doesn't need to get access the 3DS Mode and the DS Mode still has many vulnerabilities