R4 Ultra’s flashcarts were clones of the Acekard 2x carts. The R4iUltra in particular was a 1:1 clone of the Acekard 2i. Both of these carts can use the AKAIO 1.8.6a build linked above. If your cart fails the AKAIO clone check, use BL2Ck instead.

Setup Instructions (AKAIO)

1. Format the SD card you are using to FAT32
2. Download AKAIO 1.8.6a
3. Extract the AKAIO 1.8.6a .zip file to your SD card root.
4. Place any .nds game ROMs you’d like to play into a folder of your choice which isn’t the __aio folder.
   • (Optional) You may want to create a Games folder to store your ROMs in to keep the root of your SD card organised.