I asked few pages ago if this would save me from ban if I format my shroedinger 3ds offline and then connect back NNID to clean console. This sounds like good solution to save at least one machine.
Or they changed security hardware in n2ds which will prevent hacks.
I still have not checked my 3ds/Switch but I'm curious if switching now to stock FW and delete all stuff and activity history will help prevent ban as I haven't played online for like 5 months