HTC One E8 - Manual (Page 125)

Performing a factory reset from settings
1. Go to Settings, and then tap Backup & reset.
2. Tap Reset phone.
3. If you want to delete media, documents, and other data from the phone storage,
select Erase all data.
To also delete media and other data from your storage card, select Erase SD
card.
4. Tap OK.
Performing a factory reset using hardware buttons
If you can’t turn HTC One (E8) on or access settings, you can still perform a factory
reset by using the hardware buttons on HTC One (E8).
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.
125 Sync, backup, and reset