How to hard reset HTC One?

If you are the HTC One users and your device having problems and you can not finish it, maybe factory reset (also called a hard reset or master reset) can help you to solve it. A factory reset will make your smartphone re-regulatory like the first time you use it.

If you do the hard reset HTC One, may be you will lost the your data such as:

Your Google Account
All the data that you add in Settings > Accounts & sync
Your personal data such as your profile, contacts, messages, email, calendar events, and more
System and application data and settings
Downloaded apps
If at the time you hard reset, you choose the option Erase all the data then all data will be erased including your music, photos, videos, and documents. So make sure that you have been backup all your important data. However the hard reset will not permanently delete all the data from your smartphone but is better to back up all the data......