Here is a user guide about how to use R4i-sdhc 3DS RTS card on 3DS V6.1.0-x for your reference.
1. Go to its official reseller Dwtechz.com to download its software, R4i-sdhc kernel V1.71b on this page http://www.gamezway.com/r4isdhc-3ds-rts-upgrade-revolution-for-dsi3dsdslds_p18809.html
2. Extract the file
3. Copy the files in the unzipped folder into your Micro SD or SDHC card.
Note: These files should be put into the root directory of the memory card.
4. Then copy your NDS games into the root of your Micro SD card
Then enjoy games on your Nintendo 3DS, DSi, DS Lite or DS.
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