I will give you a straight and true answer.Cause of the music.
I didnt understand anything what you said now lol...
Buy a New 3DS. When you do check the system settings. If it is 9.3 or higher Sky3DS is your ONLY option.
If it is 9.2 or lower then you can use Gateway which requires a copy of Cubic Ninja or Ocarina of Time. Or you can use Pasta which only requires a copy of Cubic Ninja.
Edit: And you will NOT be able to downgrade your system. If you're on 9.3 or higher, Sky3DS is all you can do.