If you're having trouble getting the new HTC One Android Jelly Bean 4.3 to work (it gets to about 20% and then restarts repeatedly), I discovered a problem with the updater. It won't work if you have GO Launcher (or any launcher that matter) aside from HTC Sense as your default launcher.
So... TURN OFF the GO Launcher or whatever one you're using.
Here's how to turn off GO Launcher:
From your desktop click on the "..." button, and go to Preferences, then turn off as the default launcher, and EXIT the app.
Now it'll work just fine.
