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usbmsc identifier (non-unique)

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I tried to Install Mac OS X Yosemite, the installation was successful but after that, I can't boot into Yosemite. As Bootloader i've tried Chameleon EFI but it directly booted into Windows, so i tried to boot with my Clover UEFI USB Stick: It stop at "usbmsc identifier (non-unique)" but I had just my Mouse, Keyboard & Clover Stick connected. I've already tried some solutions I found on Google (like this) but nothing worked...

Can someone help?

My System:



I hope someone understands me & can help me.. :D

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