R4 cartridges and other flashcarts, used in some cases (if not most) to pirate Nintendo DS games, are no longer allowed to be sold, advertised or imported into the UK. According to GI.biz, London's High Court ruled that the devices are illegal -- much to the chagrin of those who use it for actual homebrew purposes -- because it requires bypassing Nintendo's security to use.

Nintendo and friends have been working hard to wipe out the R4 devices around the world. Nintendo claims that over 100,000 R4 devices have been seized in the UK since 2009.

This article was originally published on Joystiq.