Posted on their English forums by an Administrator:
Source
Google Translation
edit:
To clear the 1.4.1/ 1.4.2 issue up, there are 4 releases of firmware 1.4.1. You have 1.4.1A (Australia), 1.4.1E (Europe), 1.4.1J (Japan), and 1.4.1U (US). 1.4.2C is only for China, doesn't not block any additional flashcarts other than those which 1.4.1X blocks, and has not been seen outside of China.
QUOTE said:To use: download the .zip file and copy "system1.dat" to "root/_dstwo"folder and replace the same-name file.
Download the international version of the update here. This will update your DSTWO even if your DSi has already been updated to 1.4.1. There's a mention of a DSONEi update for next week.
They have one international update for those DSTWO carts which have English writing on the front of the cart, and another Chinese update for those that have Chinese writing on the front cart. Ensure you use the correct file, the file linked above is the international version for our carts.
Source
The original post on the Chinese Supercard forum also by their Administrator:.
QUOTEDSTWO firmware upgrade to support the latest firmware 1.41 & 1.42C DS
DSONEi?????????DSONEi?????????????~ DSONEi make up will be trouble spots, DSONEi will release the corresponding firmware upgrade next week ~
DSTWO????????? ? DSTWO upgrade mode actually has three:
????????????????????1.05??? Now see only one, that is, long before the 1.05 firmware upgrade too.
????????????DSTWO?????????FLASH???????TF????????NDSI??~ The upgraded model with the second, DSTWO rather special, no need to upgrade FLASH program, simply replace the TF card file, you can upgrade ~ should NDSI
?????????????????????? The third model: extreme is totally blocked in the case. ????dstwo??ds?????CPU???????? Just insert the card into the ds dstwo host CPU to perform the upgrade command directly. ?????????????????????????? In fact, and computer theory, is that a power lead boot the computer to restore the system.
??????????????~ The updated firmware can be upgraded without ~ ?????????????????CPU?????~~ The second and third upgrade mode, which requires built-in CPU can do ~ ~
????????????????? Note: Chinese and multi-language version is not common! ??~~????????~ Remember ~ ~ Oh ~ that would otherwise black screen error
Q????????????? Q: I do not know what version?
A???DSTWO??????????????????????????2in1???????? A: See DSTWO card sticker, if you write the Chinese words that is the Chinese version, written 2in1 is multi-language version.
???? ???????????system1.dat???TF??_dstwo????????????????? Usage: After downloading extract the archive copy will system1.dat TF card _dstwo folder directory, replace the cover with the same name files.
Google Translation
edit:
To clear the 1.4.1/ 1.4.2 issue up, there are 4 releases of firmware 1.4.1. You have 1.4.1A (Australia), 1.4.1E (Europe), 1.4.1J (Japan), and 1.4.1U (US). 1.4.2C is only for China, doesn't not block any additional flashcarts other than those which 1.4.1X blocks, and has not been seen outside of China.