So now you don't need to update your firmware it's necessary for 2nd and 3rd method that you have a burning card with CPU in it.

Warning: CHINESE VER. FILES CAN'T USE IN THE LANGUAGES VER. OR DS WILL BECAME 2 BLACK SCREEN

Q: i don't know what ver. My card is!
A: it's on the sticker on your card, “中文版”or“2in1”

To use: download the .zip file and copy "system1.dat" to "root/_dstwo"folder and replace the same-name file.

DSTWO English.zip
DSTWO Chinese.zip

Source- Supercard Forum