When SX OS initially came out, several people did report having their legitimate cartridges get banned with the error code you are mentioning but as of recently, those reports have decreased. You also may not know if your cartridge is banned or not if your system is banned as I'm unsure which error code would appear first, the console or cartridge ban. But I would say its still a potential issue. Heck, even if the used cartridge isn't banned, someone could have easily bought the game, dumped the certificate/header, and returned the game which means you risk getting banned if you play that game online.Oh... It was never a problem then? I recall a tweet from SciresM saying cart certificates being banned...