Thank you very much!!!
Just downgraded my N3DS XL Majoras Mask edition.
From 10.3 to 9.2
Hax was IronHax and (I don't want to say something wrong but) I've used my Mac.
Oh and it was the first try, I just had to reboot the 3DS by myself because it stuck at the end.
I am trying to hack Fire Emblem Warriors on my 2DS XL, I have been trying to get it to work, but I need some extra help figuring it out. I have HEX codes, and a possibly outdated plugin, but I dont know how to implement them