Before you buy a new cell phone or new tablet, please try the following procedure to repair your device. First charge your battery, backup your important data if possible and in most cases take out SIM and SD card before factory reset. It is impossible to recover your data after doing a hard reset, so online backup is always important. For all of your data, a backup should be done on an external device, hard drive, raid system or media. With or without insurance, if your cell phone lost, damaged or stolen at least your invaluable data is backed up in a safe place. If you are about to sell your phone and you want to wipe your personal data, or if your phone affected with virus you have to do a hard reset. In some cases, you can delete the forgotten password or lock pattern from your device as well. All information is for devices with stock based ROMs. If you are using rooted device, always back up your EFS folder first, containing your IMEI info, etc.!


    Restarting or factory resetting your phone

    Restarting your phone (soft reset)
    If your phone is running slower than normal, an application is not performing properly, or your phone becomes unresponsive, try restarting your phone and see if that helps solve the problem.
    If the display is off, press the POWER button to turn it back on.
    Unlock your phone if the Lock screen is displayed.
    Press and hold the POWER button, and then tap Restart.
    When asked to confirm, tap Restart.
    If you can’t restart the phone following the above steps, remove the battery, wait for a few seconds, reinsert the battery, and then turn the phone on.

    Performing a Desire HD factory reset (hard reset)

    Performing a factory reset using phone buttons

    If you can’t turn on your phone or access the phone settings, you can still perform a factory reset by using the buttons on the phone.
    With the phone turned off, press and hold the VOLUME DOWN button, and then briefly press the POWER button.
    Wait for the screen with the three Android images to appear, and then release the VOLUME DOWN button.
    Press VOLUME DOWN to select FACTORY RESET, and then press the POWER button.

    HTC Desire HD hard reset

    If you’re passing your phone on to someone else or your phone has a persistent problem that cannot be solved, you can do a factory reset (also called a hard reset). This returns your phone to the state it was in before the first time you turned it on.
    Factory reset will not erase the data and files that are on the storage card.
    Factory reset is not a step to be taken lightly. It’ll permanently delete all your data and customized settings, and will remove any applications you’ve downloaded and installed. Be sure to back up any data and files you want to keep before you do a factory reset.

    Performing a factory reset via settings

    From the Home screen, press MENU, and then tap Settings.
    Tap SD & phone storage > Factory data reset.
    On the Factory data reset screen, tap Reset phone, and then tap Erase everything.