Did you install it properly? Spoiler How to update the kernel? By using the TF card reader, connect your TF card with computer, open the file. a. Upload game kernel: Copy the R4.DAT file to your TF card. b. Upload video kernel: Copy the Moonshl2 to your TF card. c. Upload DIY Interface function: Copy the R4iMenu to your TF card.
You mean on your DS menu it says no card? Then it's not a firmware issue. The problem is the contacts on the card aren't making proper contact with the DS slot.