Hmmm, missinformation.
- If your game is not patched -> DNAS error -402
- If you're playing original games with your modchip turned on -> DNAS error -402
- If you're playing a patched backup with the wrong ID -> DNAS error -864
- If you're playing a game from another region ie. PAL game on NTSC console or vice versa -> DNAS error -833
So no ban just the errors. The modchip doesn't have to be turned off with a patched backup, only with original games.