In order to hard reset a BlackBerry DTEK50, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
BlackBerry DTEK50 device will be brought back to the default configuration of a brand new device.
1. Switch on your phone by pressing and holding the Power button.
2. Now tap Settings > Backup & Reset.
3. Choose the Factory Data Reset.
4. Reset Phone is the next option to choose.
5. Complete the process by selecting the Erase Everything option. Remember! This will erase all the date from your phone, leaving it in its default state.