A R4 is a flash cartage for the Nintendo DS used to play games, movies, music, and homebrew on the DS.
It is not illegal but has been cracked down on in some countries including Japan. The problem with the R4 is that it's like selling blank CD's - it's legal to own, but some people use them only to pirate games and illegally play games they haven't yet bought.
If you buy an R4 and just back up games you already own (so you don't need to take so many cards on holiday for example) this is completely legal.
France takes R4 DS legal but UK illegal, and users need both R4 DS and Game ROMs. The problem is that Game Developers and R4 Manufactures need to find the right way to bring more for customers.
There is a kind of Wood R4 Firmware for R4 DS, which written by Yellow Wood Goblin. And R4 DS users can download.
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An R4 adapter is an adapter for the Nintendo DS. It is the same shape as a Nintendo DS cartridge but it holds a micro SD memory card. The point of it is to save your games on the micro SD card. You can also watch movies, browse photos, read e-books and listen to music!
www.r4card-mania.co.uk
R4i cards is a R4 card's next generation, just like a father and a kid.
R4i cards is designed for the DSi console at the beginning, lately, while the DSi XL , 3DS console comes out.
R4i cards is upgraded to work on the DSi xl , and 3DS.
There are many kinds of r4i cards indeed. But before your buy, you need to pay attention to the kernel, for how long the kernel released. monthly, several months. I do not think that there is a r4i kernel released weekly according to my experiences.
Many online site sell r4i cards, but it is suggested to buy from the authorized reseller, since you can got a real warranty from them.
There are many site, such as,
www.priceminister.com
www.shoppingwiki.com
www.coolgadgetsgift.com
and so one, by the way, most sales are with free shipping. :)