today the r4i-sdhc 3ds rts card official team has released the new kernel V1.75b with the changelog below
R4i V1.75b Update:
1. Support 3DS 6.3 upgrade For RTS card (certain model only).
2. Fix some RTS games white screen issues.
3. Fix some RTS games hang issues.
4. Fix some RTS games problem.
5. Solved games:
6244 - Mama's Combo Pack - Volume 2(US)
6243 - Mamas Combo Pack - Volume 1(US)
6215 - Cooking Mama World - Combo Pack Volume 1 (EU)
6213 - The Smurfs 2 (US)
6208 - The Smurfs 2 (EU)
6015 - Detective Conan: Kakokara no Zensou Kyoku (JP)
2. Solved RTS games:
6248 - SpongeBob SquarePants Planktons Robotic Revenge(EU)
6225 - Finding Nemo Escape To The Big Blue Special Edition (EU)
Do yourself a favor, don't buy crappy flashcarts.