Hard Reset HTC HD7S

1. Startup the mobile phone Power button. 
2. Press and hold both Volume buttons.
3. Briefly press the Power button 1-2 seconds not more.
4. After that Follow on screen instruction.
5. Factory reset can take even several minutes.
6. Done, after restart phone is back to Default settings.

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