This has nothing to do with the thread - make your own.
Sorry if this is a bit of a bump, and you might know this already but w/e.
If you have Ninjhax you can install Braindump and dump your rom onto your SD Card on a 3ds up to v10.2 I believe.
For Ninjhax you need cubic ninja, which can be bought for about $50.
A more complicated alternative is the N3DS exploit for sm4sh, but it's only recommended if you have a lot of time on your hands and you know what you're doing.
Once you edit your decrypted rom, you can rebuild it and run it with HANS.
If you need help, you can PM me and I will try my best to help. But unless you get a Gateway(which idk if it works on v9.9) your best bet is Ninjhax.
Good luck.