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.!
Performing a HTC EVO Design 4G hard reset
Sprint EVO Design 4G LTE smartphone factory reset
Performing an EVO Design 4G factory reset using phone buttons
Important: Make sure to back up important data you have on the device or your microSD card before you perform a reset.
To hard reset HTC EVO Design 4G first power off device, or if the screen doesn't responding remove the battery.
Reset Your Device Using the Device Keys 1. With the device turned off, press and hold the volume down button, and then press POWER. 2. When the device’s display turns on, release the volume button. 3. Use the volume button to select FACTORY RESET, and then press POWER. (All data will be deleted from the device.)
Reset Your Device via Settings 1. From the Home screen, touch MENU key > Settings > Storage > Factory data reset. 2. If you also want to erase all data in the installed microSD card, select Erase SD card. 3. Touch Reset phone. 4. Touch Erase everything. Your device will power down and reset itself, which may take up to 10 minutes. Once the device has reset, it will run through the Hands Free Activation and update processes again. When finished, you will see the Welcome screen and Setup application. See Complete the Setup Application to start over.