In order to hard reset a BlackBerry Classic, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
BlackBerry Classic device will be brought back to the default configuration of a brand new device.
1. Good day. To begin, power up your phone by pressing the Power button.
2. Now enter Settings.
3. There, select Security and Privacy followed by Security Wipe.
4. You will be presented with a box to type "Blackberry" into
5. Choose Delete Data. Voila, you've completed the Hard Reset.