Do please not think of cubic ninja if you want to have your 1.0.0-U nand dump.
I don't know any working method for 1.0.0 with MSET, this is really rare so no software method supported currently for nand dumping for such a version.
Just find yourself a hard-mod guide, or ask for someone to help you with the mod, or even..
You could ask them if they want the dump first on irc, so some guys may even tell you who is an expert on modding it.
Any updates applied and your NAND dump would be significantly no special use.
For CN you would need to launch the game first, which would surely update it, also without updating browser, and that would be above 4.x.
The only way for you to choose if you want to get it hacked is find yourself a cart with 4.5 update, so you could use MSET.
Still if you think you would like to keep the special NAND dump, do a hard-mod, there isn't any other known ways.
EDIT:: If you've already updated it by yourself, hope you do update it to 4.x in order to be able to hack it.