You should have used the new guide : p
It does if you have a non new 3ds tho.
https://github.com/Plailect/Guide/wiki/2.1.0-ctrtransferthe outdated guide seems better to me because the current one doesnt detail how to use ctrtransfer or what files go where in downgrading sysnand to 2.1
It does if you have a non new 3ds tho.