The r4i-sdhc RTS Cards Official website has released a good news:
The r4i-sdhc rts card can support N3ds V6.1.0-x perfectly((certain model only), please update your kernel to V1.71b. If your RTS CARDS can not support firmware update for this moment, please be patient, upgrate firmware will be released very soon.
Maybe the newest r4i RTS Cards support 3ds v6.1.0-x directly since it is said some certain model only.
About the old cards, We just waitting for the good news.