htc one hard reset factory
Be sure to back up any data and files you want to keep before you do a factory reset.
A factory reset may not permanently erase all data from your phone, including personal information.

Performing a factory reset from settings

  1. Slide the Notifications panel open, and then tap File:/GUID-4832DF58-7047-4C2E-85CC-2409C5914591-web.png.
  2. Tap Backup & reset.
  3. Tap Reset phone.
  4. If you also want to delete media and other data on HTC One, select Erase all data.
  5. Tap OK.

Performing a factory reset using hardware buttons

If you can’t turn HTC One on or access settings, you can still perform a factory reset by using the hardware buttons on HTC One.
  1. Press and hold the VOLUME DOWN button, and then press and hold the POWER button.
  2. Wait for the screen with the three Android images to appear, and then release the POWER and VOLUME DOWN buttons.
  3. Press VOLUME DOWN to select FACTORY RESET, and then press the POWER button.