Could downloading games/other content using a game copier/mod chip potentially expose my family to unsuitable content and potential viruses?
Yes. Downloaded, unauthorized content from the Internet may contain viruses that could compromise the Nintendo hardware system. Playing illegal downloaded games requires the system to be modified, either with unauthorized software or the installation of a modification chip or game copier used with the Nintendo Handheld systems. These devices circumvent security protections and can open the device to viruses and other undesirable content.
