Hello. I am writing a tool that may help 3DS development, and I found an exploit that enables a cartridge to be booted at the system setup, so here's my question: Is the system setup user land or kernel? Is it Arm9 or Arm11? Thanks in ahead.

Thats not an exploit. That is public info that has been known since the 3ds came out.I found an exploit that enables a cartridge to be booted at the system setup