Nintendo has spoken before about the strong anti-piracy measures in 3DS, but there's been little more specific said. Now a rumour has surfaced that using a flash cartridge or similar device will actually render the console useless through a firmware update.
A rough translation of a poster outside Japanese retailer Enterking reveals this information:
Non-purchase able 3DS system: if you use equipment which is illegal or unapproved by Nintendo or if you do customisation which is unapproved by Nintendo, there is a possibility that Nintendo 3DS becomes non-bootable by system update.
Whereas firmware updates for past Nintendo consoles have attempted to prevent pirated cartridges from working, this would be the first time an update could stop the actual machine from working.
Of course, this is just a rumour based on an unofficial translation, but we'll find out more in the coming weeks as the machine's global launch nears.