I'm on the latest WiiU fw version. I tried both Configurable USB loader and USB Loader GX, and both of them give me errors like when you used to connect the HDD in the wrong port back in the Wii times. Here's what I did: I installed the Homebrew Channel, tried to install cIOS 236 but for some reason it didn't want to, so I just installed the d2x cIOS and downloaded both managers. Is there anything obvious I'm missing? I've tried all USB ports now, and I tried with my HDD on a hacked Wii and it worked.