The R4i Gold can work on 3DS perfectly!
Support R4ids official: www.r4ids.cn


R4i Gold 3DS Version Features:
-First card to support 3DS.
-First card to hack DSi 1.41 version firmware
-Compatible with all DS editions of different kinds of language
-Supports Action Replay cheat
-DLDI auto-patching
-Support SDHC (Micro SD 4G,8G,16G,32G)
-2nd generation storage device (no booting tool required)
-Flush fitting slot 1 card
-Uses MicroSD card, FAT16 or 32
-Supports any MicroSD card speed with no lag in game
-Supports Clean ROM, drag and drop. Works on any OS
-Built in NoPass
-Automatically detect save type
-Save directly to MicroSD card, not to onboard chip
-Supports Moonshell and other homebrew.
-User friendly skinnable interface. Touchscreen or button operation
-Supports rumble pak and memory pak
-Supports the WiFi game, DS Rumble Pak, DS Browser
-Supports changes of the background of Operation Interface
-Support Skin DIY by setting background and font colors on Main Menu and Game Menu manually and automatically
-Supports 4-scale-lightness adjustment ( DS Lite only )
-Supports the Soft Reset.
-moonshell 2.02 support Software Reset function( Press START key back to the R4 menu)