Don't forget to tell there is a high risk of brick on New 3DS in case of downgrade.
Make a downgrade without Hardmod installed and NAND bakup is a big risk-taking because the console can be out of order without possibility of restoration.
Recently, a customer of mine wanted to downgrade his New 3DS XL v10.5.0 and now he has bricked it and the recovery mode does not work.
So he bought me a console directly into v9.0 to replace it...
So please don't tell to newbies that downgrade is easy and safe on New 3DS.