Today the r4i sdhc 3ds flashcart (r4i-sdhc.com) official site has updated the r4i sdhc 3ds kernel from V1.69b to V1.70b. the new kernel didn't fix the block problem, it is not a fix for the 3ds V6.0.0-11U block. so this flashcart currently still can not work on the latest 3ds firmware. here is the change log

R4i V1.70b Update:
1. Fix some RTS games white screen issues.
2. Fix some RTS games hang issues.
3. Solved RTS games
XXXX - Apprends avec Pokemon: A la Conquete du Clavier (FR)
XXXX - Cooking Mama World - Combo Pack - Volume 2 (MX)
5994 - Ben 10 Triple Pack (EU)
5917 - Just Sing! Volume 3 (EU)
5895 - Phineas and Ferb: 2 Disney Games (EU)
5830 - Harvest Moon: The Tale Of Two Towns (US)
5093 - America's Next Top Model (US)
5069 - Kaidan Restaurant: Ura Menu 100-Sen (JP)
5044 - The Princess and the Frog (US)
4. Solved games:
XXXX - Apprends avec Pokemon: A la Conquete du Clavier (FR)
XXXX - Korg DS-10+ Synthesizer Limited Edition (Japan)
XXXX - Apprends avec Pokemon: A la Conquete du Clavier (FR)
XXXX - Cooking Mama World: Outdoor Adventures (EU)
XXXX - Cooking Mama World - Combo Pack - Volume 2 (MX)
6177 - DJ Star
4268 - Mario & Luigi RPG 3(EU)