does it actually say version 2.0 Rosalina when you load it?
yeah. hm, after some testing it seems it works fine if I load it with my hblauncer cia (I want to remove it though), but if I use safety app it loads, says Rosalina 2.0, but trying to start anything just freezes the whole system. hm.
This is on new 3DS, 11.4 JP if that matters.
o3ds 11.4 EU does not have this problem, works fine when loaded through safety app and loads homebrew just fine.