Originally Posted by sassij
Thanks for the tip, I tried that and it wouldn't work. Do I need root or s-off?
No, the phone does not need to be modded to run the RUU. Its a "official" update/recovery tool provided by HTC. If you phone is stock, it should work, as the above response also indicated.
If it "wouldn't work" it would be more helpful to give details, if you want proper help. Not just say it didn't work. What step did it fail at , any error message, etc. Also, the current state of your phone (root, unlocked bootloader, etc.), as we can only assume based on your comment about root, etc.
RUU failing on a stock device is usually a USB connectivity issue on the part of your computer (not a problem on the phone's side). Install or re-install the HTC drives, try a different USB port, or a different computer (if available). If on Windows 8.1, that version is a known issue and will not work with the HTC drivers. You can also try re-downloading the RUU to make sure it wasn't damaged/corrupted during download.
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Phone: AT&T HTC One (M8)
Tablet: Samsung Galaxy Tab Pro 8.4 (WiFi only)