This is a translation of a translation.
A Korean guy in the korean rom hacking forums translated the japanese into korean, and I'm translating the korean into english that you guys can understand
Original
DSi?HelloWorld????????????????????????????
?????????????????????????????????????
???????????????????????????????????…
CFW?????????FW????????????jk?PSP??????????
Korean
(??) DSi?? HelloWorld ??? ??. ???? ???? '?' ????. ??? ?? ?? ??? ?? ???, ??? ? ??? ?????. ??? ???? ??? ?????, ??(????) ??? ????.. ??? ???? ?????. ??? ????... CFW(??? ???) ????? ????, ???(FW)? ??? ???? ????..? PSP? ??? ???.
English
(Translated) Making HelloWorld show up on the DSi successful. It was done by "the" way that you guys were thinking. The one who ran it was a person with a DSi, not me. However, I will wait a little more until I release what I found out, because I don't support the common use of flashcarts.. First of all, I need to get the actual device. Will they still sell it... CFW(Custom firmware) would be nice, but wouldn't there be a signature on the FW(firmware)? [note from psycoblaster: by signature, read mystikekoez's post right below this.] How was the PSP done?