Since Decrypt9WIP (Aug 2016 or later) 's CTRNAND transfer enhanced the region changing, we don't need the old tutorial's Part 1 ~ Part 11 now.
From Plailect's Guide (CTRNAND transfer based):
Preparations
- TWN/CHN 3DS 4.1-9.2
- DS Flashcart (for 4.1-4.5, optional)
- Decrypt9WIP
- 2.1.0-4...