It is advisable to make a backup before using it, since despite being well tested, failures can occur.
I am not responsable of bricks, melted switch, nuclear explotions or full aniquilation
The premise is elimination. Can it be the lack of information that makes you get banned? So far the case has not happened.
It is true that it is not 100% safe, but the people who have tested it have not been banned yet Reference
Haku33 is a simplification of this method of clean
If you have a clean backup of the Nand, it is better use that,
If your console is Banned there is nothing to do
This will completely clean your switch, so you will lose everything
Mariko consoles cannot reboot to the payload , so to load the payload Haku33 have to Overwrite some files on sd
Keep in mind that this program will not UNBAN you, or will it make you immune to BAN. You will have a console as just out of the box, that's it. So you can go online as long as you keep the console clean of cfw.
We found 3 solution for the problem
1 just run atmosphere on Sysnand
2 delete system:/saves/8000000000000120 using tegra explorer.bin
And then run atmosphere to rebuild db
Or
3 delete system:/saves completely using tegra explorer.bin an the run atmosphere (this will make a full factory restart)