Hiya, I have a New 3DS XL, and I have already soldered the wires to it. I put a connector in the back of the case for an SD card adapter that I can plug into my computer, as is recommended by the guide. When I plug the SD card into the computer and turn on the 3DS, it shows only a black screen (forever) with a blue LED. I have to hold the power down for like 10 seconds to turn it off; disconnecting the SD card does not help. However, when the SD card is not plugged in and I start the 3DS, it boots just fine. I guess my goal right now is to get the blue error screen so I can read the img. I am not using a recommended card reader. I will buy one if it'll solve the problem, but that's why I'm asking here first to see if this is normal behavior for unsupported SD card readers, or if my wiring is wrong. I did check everything with a multimeter and it seems okay, but I'll double check. Thanks for the help.