You need:
- A 9.0 - 9.2 (n)3ds
- The latest gateway firmware: https://www.gateway-3ds.com/downloads/
- The 2.5 HBL boot.3dsx: https://smealum.github.io/ninjhax2/boot.3dsx
- The latest HBL version of FBI: https://gbatemp.net/threads/release-fbi-open-source-cia-installer.386433/
- A cia version of FBI (Comes with download above)
- A cia version of Cubic Ninja from your region (can't provide this, but a certain iso site might be able to)
- An Internet connection
- PastaCFW files: http://jheberg.net/captcha/pastacfw-for-ninjhax2-90-92/
1. Copy the boot.3dsx to your micro-sd card root
2. Copy the "3ds" folder from FBI on to your micro-sd card root.
3. Copy the PastaCFW folder into the 3ds folder.
4. Copy the cia files on to your micro-sd card.
5. Setup Browserhax: https://gbatemp.net/threads/yellows8s-browserhax-thread.398132/
6. Launch the HBL with browserhax.
7. Choose the PastaCFW
8. Once you're back in the menu, immediately start the HBL again
9. This time, choose FBI.
10. Use FBI to install the FBI cia
11. Put the gateway's launcher.dat on your micro-sd card root.
12. Boot into the Cakes/Pasta CFW.
13. Start FBI and install Cubic Ninja.
14. Start CUBIC NINJA, choose "Create", then "QR code", and finally "Scan QR code".
15. On your PC, go to the GATEWAY ULTRA 3.X/Save Games for New 3DS/Cubic/your_region folder and scan the QR code.