You wasted your money by getting an R4, just letting you know. It's work, sure, but pretty much every other device on the market is superior at this point.
For GBA homebrew (please read the DCEmu rules), the EZ-Flash 3in1 will work. You'll use a homebrew app called GBA ExpLoader to load games from your slot-1 microSD card to the 3in1 and launch them.
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