This video will show you how to run an RUU on your PC to return your HTC One back to stock. This video shows a Sprint HTC One, however this method should work just fine for other carriers once an RUU becomes available. I will link to all available RUU's at my site in the link below.
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All RUU files and info found here:
http://qbking77.com/development/how-to-unrootunbrick-the-htc-one-to-stock-2/
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