HTC One Remix - Manual (Page 185)

Files such as your music, photos, videos, and documents can also be
deleted from the storage, if you chose to do so.
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. 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 remix on or access settings, you can still perform
a factory reset by using the hardware buttons on HTC One remix.
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.
Sync, backup, and reset 185