As other people here told you, you can install CIAs on SysNAND by booting into GateWay mode while pressing X (GateWay 3.2.1 only) and using BigBlueMenu.3ds on your GateWay red card to install DevMenu_2x.cia on your SysNAND, and then you can install mset_reg.cia using the DevMenu you just...