It has its own firmware, it doesn't use an 'operating system' as such.
You can't trade JUST you DSi system in for a 3DS system anywhere.
Nintendo DSi XL is defenitly better vecause it is bigger and has more applications on it, also its easier to log on to the internet on it.
Yes
DSi Ware games and other downloadable content The Nintendo DSi Shop is specific to the region for which the system was manufactured. For example, a Japanese system can download DSi Ware games and other software only from the Nintendo DSi Shop for the Japanese region, regardless of where the system is being played. Nintendo DSi exclusive game cards Nintendo DSi game cards that are only compatible with Nintendo DSi and Nintendo DSi XL (and not Nintendo DS or Nintendo DS Lite) are region locked. This means game cards manufactured for the U.S. market would not work in a system made for another country. Nintendo DS / Nintendo DS Lite game cards Older Nintendo DS and DS Lite software is region-free, so you can play most of that software on a Nintendo DSi and Nintendo DSi XL from any region. It's possible, however, that future Nintendo DS software will incorporate region encoding. In these instances, these games would not work in a system made for another country. Source: http://www.nintendo.com/consumer/systems/dsi/en_na/faq.jsp#vers
All system updates for the Nintendo DSi are provided free of charge.
It is a nintendo operating system
In America: A Nintendo DSi is $140; a DSi XL is $160. In Japan: A Nintendo DSi is ¥15,000; a DSi LL is ¥18,000. In the UK: A Nintendo DSi is £150. In Australia: A Nintendo DSi is $300.
No. The Nintendo DSi is a system that it already released and therefore cannot be pre-ordered because it can be bought on the spot.
yes nintendo is always coming up with new systems. the new systems are dsi xl and 3ds
tap the Nintendo dsi shop icon on the Nintendo Dsi , or Nintendo DSi XL start up screen
Should be pre-installed on system. If not, can be downloaded from Nintendo DSi Shop.
You can't undo it.