Xtc2Clip Error Sprint HTC One

Everytime i Want to S Off my Sprint M7, it goes well on my PC. But when I but the USB cable on the Pc, the Y cable of it at Xtc2clip and my device, and then boot to fastboot and choose simlock
It sais: SD not Found
Even tried to reboot to Bootloader, didnt work.

Plz help

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