I just got my hands on a pre-owned Wii U. When i try power it on the Wii U logo appears, then the screen turns black showing -3 in top left corner. I am new to this stuff but figured there the firmware might have been modified. So i put something called haxchi on a sd card and the console now boots in to the haxchi software. When i press the home button to get to the system menu it reboots to haxchi. Any ideas how i can get it to boot in to the system menu. Or how i can proceed to make the console useful?