Hard Reset HTC One X+

First method:

1. Turn off phone by pressing Power button.
2. Press and hold Volume Down + Power button.
3. Release the buttons when u will see three Android images.
4. Navigate to "FACTORY RESET" to browse by using Volume buttons, and to choose optionPower button. 
5. Afterwards phone will restart itself.

Second method:

1. Start by going to Settings next to the Backup & reset.
2. Search Reset phone and select it.
3. Mark Erase all data if u want wipe your device totally.
4. Press the OK.

WARNING !
Hard Reset will erase all of your data
All described operations you are doing at your own risk.