If you’re passing
HTC One X on to someone else or
HTC One X has a persistent problem that cannot be solved, you can perform a factory reset (also called a hard reset or master reset).
Warning: Factory reset will permanently remove everything that's in the phone storage, which include your media files, data, and customized settings, as well as apps you’ve downloaded and installed. Be sure to back up any data and files you want to keep before you do a factory reset.