I have a similar problem, when installing the exploit on a "old"3ds it works fine, but installing it on my new3ds just crashes and exits the game, it tells me that it will reboot. I made sure to select correct version in the installer, by the way.
Both consoles have a9lh+luma and are on 11.2.0-35U, and other entries work(installed cia and Steelhax).