Oh, well yes. I connected it to the Wii U and it formatted it. I'm sorry, I thought Fat32 is what the Wii U uses. And without cable, I mean a normal USB stick yes. And okay, I can try with a real hard drive.
Sorry again, I have a bit of a language barrier.
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I reinstalled Haxchi. Set language to English. Tried installing to a eternal Hard drive. Tried installing to NAND without anything plugged in. Same problem. If you guys have Discord I can provide a video because it's rather hard to explain :/