HTC Tattoo hard reset
Resetting the Phone
Resetting the phone deletes all data, including downloaded applications, and resets the phone back to its initial state, the state before you turned on the phone for the first time.
Important Make sure to back up important data you have on the phone before you reset your phone.
To reset the phone
1. Press HOME > MENU, then tap Settings > Security > Factory data reset.
2. On the Factory data reset screen, tap Reset phone and then tap
To reset the phone using phone buttons
1. With the phone turned off, press and hold the HOME and BACK buttons, and then briefly press the END CALL/POWER button.
2. Press the ENTER button to begin the reset process.
Tip If your phone hangs or freezes, remove the battery then wait for a few seconds, and then re-install it. After re-installing the battery, turn on the phone.