Bricked your HTC One? Don't fret. HTC just uploaded full 1.4 GB RUUs for both the M7 and M8 developer and unlocked editions. These are for the latest Lollipop versions of Sense 6, though most owners should already have had this update pushed to their phones.
If you want to flash this on your phone, you'll have to download it on a desktop computer first. Just remember, doing so will wipe your device. This is why it comes in handy if your device is stuck in a boot loop or something like that; it's a last resort. Otherwise, this may help some developers of third-party ROMs at places like XDA.
For more instructions, follow the source links to HTC.