The only true way to prevent banning, is dumping the NAND before doing anything drastic in usage to the console and staying offline. Then restoring the console with the previously dumped NAND and thus preventing a ban if you should go back online, which the NAND from this point can be dumped again, to be restored later... Painstaking, but it works.
I've dumped and restored mine four times already, which you could think of it at using savestates to keep the console safe after you've used homebrew and save editors (which it's not recommended to use edited saves online).
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