Instructions
Download and install the R4i drivers and software from the R4i website at R4i-SDHC.com.
Connect your MicroSD card to your computer using the adapter included with your R4i purchase.
Open Windows Explorer by pressing the Windows button and "E," then right click the MicroSD card and select "Format." Format the disk as FAT32.
Drag and drop the items from the R4i software folder onto the MicroSD card.
Remove the MicroSD from the adapter and insert it into the R4i card.
Insert the R4i into your Nintendo DSi XL and turn on the power. The system should load to the R4's operating system.