I can't get usb loader gx rev935, 4.3U rev20 to recognize my RB mic every time I start Def jam Rapstar it states no mic detected. I tried ios249, 222, 254 but it will not detect the mic. I works fine on dvd as explained below. I would love to get it to work on my external drive. I have the old rock band mic that is plugged into the opposite usb port than the loader and this is how it is working for me. Burned on verbatim dvd-r @ 4x and installed darkcorps v1.1 and it works like a champ. Works on Wii 4.2U Rev19 dark v1.1 and on 4.3U Rev20 dark v1.1. I am still trying to get it to work on usb loader gx.