Hard Reset HTC Desire 612

First method:

1. First power off the cell phone.
2. Press and hold the Volume Down button and then press and hold Power button.
3. Release them when menu of Bootlloader appears.
4. Press the Volume Down key to select FACTORY RESET, and confirm that with Power button.
5. Done!

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