Yeah, when I load CFG Usbloader channel, it shows the loading
screen with CFG written in the middle in big, but does nothing
Maybe your hdd is not being detected because it may have gone into sleep mode, do a hard reboot and/or turn off wiiconnect24 so the wii and hdd fully powers off then try again. (I'm assuming the hdd has games, is correctly formatted and partitioned and is active and the correct CIOSs are installed).
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JUST BOUGHT A WHITE WII U! ID is uglyguy