Nintendo arent going to be happy, the CycloDS Team have confirmed that their Flashcart is working on the 3DS in DSLite Mode. Heres a screen:



Heres what else they posted:

CycloDS iEvolution running on 3DS in DSL mode on stock bootstrap and 2.1 firmware, no changes necessary - it just works. Unfortunately DSi mode is unable to be tested at the current time due to the lack of a Japanese region bootstrap.
This Confirms the story of the Video of Nintendo 3DS hacked by R4 Revolution DS Flash Cart. , looks like Nintendo are not going to be happy.