The iSmartDS team have released an update for their iSmart Premium card to allow 3ds compatibility.


Installation-

1. Download firmwareV4_3DSfix.zip

2. unzip the file

3. You should see file ISMART_firmware 4.nds

4. Copy ISMART_firmware 4.nds to your TF

5. Run ISMART_firmware 4.nds as you would a normal game


Download
Source- ismartds