I recently downgraded a Pokemon N3DS from 10.3 to 9.2 using sysupdater and i have installed gateway cfw onto it. I decided that i wanted to also be able to play NDS games on it so I installed bluecardfix.cia onto sysnand (i went through the gateway sysnand mode to install it using the red card and dev menu), it said it imported successfully. I rebooted the system and inserted the gateway blue card and it wouldn't show up. I retried using pasta cfw and fbi through the homebrew launcher...
Gateway Blue Card Not Showing
Gateway Blue Card Not Showing