I'm trying to launch my backed up NAND of my FAT32 HDD (Western Digital)
But when I try to change to the USB instead of the real NAND via Neek2o WAD on System Menu 4.1 softmodded via Softmod ANY Wii Guide and Letterbomb.

It either :
A. (no USB) Shows a Black Screen then reboots to real System Menu.
B. (with USB) Shows a "EXCEPTION (DSI) OCCURRED! : *BUNCH OF CODE* STACK DUMP : *MORE CODE*"


Please can somebody help me?