If your 3DS has been updated to system 6.2.0-12, you do not worry about it. Supercard DStwo can work on 3DS 6.2.0 directly. Its firmware V1.23 has been released. You do not need to upgrade the Supercard DStwo. Just download its newest firmware v1.23 and its EOS V1.11.
Source: Latest Firmware V1.23 Released for Supercard DStwo | 3DS/DS Flashcards & PS3 Jailbreak News