DSTWO can support 3DS V4.2.0-9 now.
The most powerful superl DSTWO has released firmware v1.16 to support 3DS 4.2.0-9x and DSi 1.44.
Rest assured to upgrade firmware V1.16.
Q:How to upgrade DSTWO firmware?
Step 1: Download the firmware..
Step 2: Unzip and copy the upgrade file such as "dstwoupdate.dat" to Micro SD.
Step 3: Make sure you have DSTWO EOS system in your Micro SD, if you don't have, please download: DSTWO EOS v1.11_0521(2012-05-21).
Step 4: Find a DS console (NDS\DS\DSLite\DSi\3DS) which can run this EOS
system, if you have the latest version console can not run EOS system,
sorry, you have to find one.
Step 5: Turn on the power, EOS will detect the upgrade file, press A to upgrade.