So, I have followed this tutorial for my New 3DS on 9.0: https://gbatemp.net/threads/tutorial-how-to-install-a-cfw-on-a-9-0-9-2-n3ds-without-cn-oot.398394/page-13
Everything worked until the "boot into Emunand" part. I put all the rxtools files in the right folders, and in HBL rxtools popped up...