I' m currently using a jap wii which is on firmware 3.2U
and my signcheck results is as follows:
"SignCheck 0.3b aka loveSexWii build report"
"Wii region", Usa
"Wii unique device id", 44865745
"IOS number", "Trucha bug", "Flash access", "Boot2 access", "Usb2.0 IOS tree"
"IOS250 (ver 65535)"...