Have scoured the internet and this site for an answer. Here we go. I'm using the Sky3ds on a New 3DS XL, v. 9.4.0-21U. I found that many roms are EU (where are all the US roms at?). Regionfour seemed like a legitimate solution to that problem. With a US rom of Cubic Ninja I follow the steps from the regionfour site. With internet enabled and connection activated I scan the correct QR code, and install successfully. These steps are all working normally, based on the regionfour site and tutorials (specifically for sky3ds/regionfour compatibility tutorials). It's the next screen, telling me to change game cards and press START, that things go wrong. I get that screen for about two seconds before it exits to the menu stating: "An error has occurred. Please save your data in any software currently in use, and then restart the system." In those two seconds, there's no time to switch games. Every bit of advice on the internet says to clear the game data in Cubic Ninja and go again. I've done that many times. I've formatted and rewritten my sd card too. US games work, so I don't think it's the Sky3ds / writing process. Any ideas? Thanks.