The Nintendo 3ds has upgrade the firmware to 7.2.0-17. If you want to upgrade your 3ds system, you should upgrade your dstwo card at first. Supercard dstwo bought before 2013.12.25 from 3ds-flashcard.com need upgrade. (The latestdstwo from 3ds-flashcard.com support 7.2.0-17 directly) You should skip this tutorial.
Important: Please make sure the power is enough! And don’t do anything unnecessary!
Q:How to upgrade DSTWO firmware?
Step 1: Download the firmware 1.25
Step 2: Unzip and copy the upgrade file such as “dstwoupdate.dat” to MicroSD.
Step 3: Make sure you have DSTWO EOS system in your MicroSD, if you don’t have, please download:DSTWO EOS v1.11(2012-12-12).
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.
Now, the DSTWO support the latest version console. Off cause if the firmware declared support the latest version console.