To dump system DSiWare, we exploit a flaw in the DSiWare Data Management window of the Settings application.
To accomplish this, we use your system's encryption key (movable.sed) to build a DSiWare backup that exploits the system in order to dump the DSi Internet Settings application to the SD root.
These instructions work on USA, Europe, Japan, and Korea region consoles as indicated by the letters U, E, J, or K after the system version.