It is confirmed from official website www.r4isdhc.com that R4ISDHC Dual-Core 3DS V6.1.0-12 and DSI V1.45 Upgrade Firmware and kernel v1.60 released, which means R4ISDHC Dual-Core can work on 3ds V6.1.0-11U and V6.1.0-12E. If you have a R4isdhc dual-core card, and you want to update it to work on 3ds v6.1.0, the method is similar with r4i sdhc-silver card.(http://r4i-3ds.com/nds-r4-3ds/how-to-update-r4i-sdhc-silver-card-to-support-3ds-v6-1-0-with-kernel-2-12-beta-205/)
This post is to tell you how to update R4isdhc dual-core card to support 3DS V6.1.0 step by step.
Make sure your R4isdhc dual-core card is the card below before you use this kernel, if your card is another one, do not use this kernel.
Step 1: Download the lastest kernel v1.60 from R4isdhc dual-core card official site, you can always find the latest R4isdhc dual-core card kernel from here: http://www.r4isdhc.com/download_white_new2013/ Currently the latest kernel version is 1.60. Just click the picture below to download it.
Step 2: After you download it, you would receive this zip file, extract it, open the folder, you should get the contents of the kernel 1.60. Put all the contents inside to the root of your sd card.
Step 3: Download the 3DS V6.1.0-12 and DSI V1.45Upgrade Firmware, distract the zip, and also cope the contents into your sd card. Make sure you should put all the firmware files on root of the sd card, too.
Then the contents of your sd card is like this:
Step 4: Put the sd card with R4isdhc dual-core card into your ds to update. Then the updated card can work on 3ds perfectly.
We suggest you to buy pre-flashed card from r4i-3ds.com, all the R4isdhc dual-core card are pre-flashed to work on the lastest 3ds v6.1.0, and you do not need to do the updating when receiving the cards.