HTC One User Manual page 140

140 Sync, backup, and reset
Performing a factory reset from settings
1. Go to Settings, and then tap Backup & reset.
2. Tap Reset phone.
3. If you also want to delete media and other data on HTC One, select Erase all
data.
4. 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.
The Fast boot option in Settings > Power must not be selected.
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.