you might need a cIOS base on IOS58 for USB accessories.
you probably follow a guide which told you to install base56 and base57 in different slots. you can try installing the same cIOS (d2x v8 final, or d2x v10 r52) with base58 in another slot. people usually do that in slot 251.
once installed, you need to tell your game to use slot251 to benefit from IOS58 in it. (game>option>IOS:251)
before installing that new cIOS, try your slot where you have base57 if you are currently using the slot with base56.
another thing, how did you plug it ? directly to USB Port 1, or did you use a HUB?
hub are not working with cIOS, be sure to plug directly the usb to the console's port.