by Hard Reset
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.!
Resetting Your HTC EVO 4G Device
Resetting the device deletes all data, including downloaded applications, and resets the device back to its
initial state—the state before you turned on the device for the first time.
Important: Make sure to back up important data you have on the device before you reset it.
Press and tap Settings > Privacy > Factory data reset > Reset phone.
To reset the EVO 4G device using the device keys:
1. With the device turned off, press and hold the volume down button (located at the right panel of the
device), and then press the power button.
2. When the device’s display turns on, release the volume down button.
3. Use the volume buttons to select CLEAR STORAGE, and then press the power button. (All data will be
deleted from the device.)