You can convert DUC to sav (aka raw, supercard or EZFlash) using max2sc:
http://nds.cmamod.com/download.html
Converting back again may prove an issue though as I do not know what has to be done or have a link for a tool to do it. Then again the source is available so I could try.
http://nds.cmamod.com/download.html
Converting back again may prove an issue though as I do not know what has to be done or have a link for a tool to do it. Then again the source is available so I could try.