I've tried and still with no lucky. I used the signCheck and here's the log about the IOS I am using:
SignCheck 0.3 aka /dev/nintystuff build report
Wii region, Usa
Wii unique device id, xxxxxxxx
IOS number, "Trucha bug", "Flash access", "Boot2 access", "Usb2.0 IOS tree"
IOS250 (ver 65535)...