Today, r4i-sdhc team has released the new r4i-sdhc 3ds rts flashcard kernel version 1.79b on their official website, and this step by step guide will help you to update your r4i-sdhc 3ds flashcard to v1.79b. For those of you still looking for an r4i-sdhc 3ds card, I'd recommend http://www.thegamerdepot.com/r4isdhc-3ds-rts-flashcart-for-3ds-xl3dsdsidslds-p-166.html it's the best and most reputable r4i-sdhc 3ds seller.
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Step 1: Download the Latest R4i-sdhc V1.79b Kernel
Download the new r4i-sdhc version 1.79b kernel from here
And extract the zip file with a free program such as winrar
Step 2: Copy and Paste
After finished, double click the kernel folder, and you will see 4 files/folders
Copy all the files and folders to the root of your microsd card, and the microsd card should be formatted at first.
Step 3: Plug the Card to 3ds
Plug the microsd card to r4i-sdhc, and plug the r4i-sdhc 3ds card to 3ds