Hard Reset HTC Tattoo

First method:

1. Switch on the device by using Power button.
2. Press HOME to go to menu.
3. Tap Settings and select SD card & phone storage.
4. Then go to Factory data reset and tap Reset phone.
5. If you are sure select Erase everything.
6. Success!

Second method:

1. Start by pressing Power button, device must be turned off.
2. Then press and hold the Home and Back buttons.
3. While holding these buttons, press the END CALL/POWER key.
4. Press the ENTER button to begin hard reset.
5. Done!

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