Hard Reset BLACKBERRY 9720
- Switch on the phone.
- Open the application tray.
- Now scroll to Options -> Security -> Security Wipe -> Tick/untick the items you would like to wipe.
- Goto the text box and tap "blackberry".
- Select Wipe.
Help! This doesn't work
Hard Reset will erase all of your data
All described operations you are doing at your own risk.