R4i gold 3ds rts flashcart is the most popular and effective solution to play ds backups on your 3ds/2ds/dsi console, using r4i gold card for the first time can be a bit confusing, so this guide is here to point you in the right direction.
Step 1: Step 1. Things You Will Need
1. R4i Gold 3DS RTS card
2. Nintendo 3DS/3DS XL/2DS/DSI/DS Console
3. MicroSD card (2-32 GB)
4. MicroSD card adaptor (will come with the r4i gold 3ds package)
The r4i gold 3ds rts card is the best 3ds flashcart to date, I've had one for about a year now, cant recommend it enough. Just wanted to give you more confirmation. http://www.r4flashcart.com/8-wood-r4i-gold-3ds-flashcart-for-3ds-xl-3ds-dsi-and-ds-lite.html is where I got mine, they ship from California and their prices are good. Okay, here is a guide to get you started
Step 2: Step 2. Download the Latest Kernel From the Official Website.
R4i gold rts 3ds flashcart uses the Wood R4 firmware developed by Yellow Wood Goblin as its official firmware. And the latest wood kernel is version 1.64. You can download it from here directly.
Step 3: Step 3. Unzip the Kernel File
After done, you will get a compressed kernel file as shown, simply uzip it with a winrar or 7zip software.
Step 4: Step 4. Drag and Drop
Open the wood kerel file and copy all the contents, drag and drop them onto the root of your MicroSD card. And put the game files with them too.