the reason .30 crashes is that the language variable in the ini is commented out. copy the ini, app, and the template.ini out of the lang folder and put them all in the root of your sd card.
So it your root dir should look like
/
savegame_manager.nds
savegame_manager.ini
template.ini
Then change the line from #language = /sgm_german.ini to language = /template.ini
save, exit, pop your SD back in your flashcart, start it up, and it should work.
Also I'd like to say that if there's ever a .31, I really hate the auto-mode-selection. It'd be much nicer if there were a menu that allowed us to pick which mode we wanted to use, as I prefer to run my slot2 homebrew from my slot1, and with the auto-select.. even with the program patched to read/write from/to my EZ4, if run from my slot1 it starts in GBA mode.