How to Hard Reset BLACKBERRY PlayBook
https://gsmfixer.blogspot.com/2015/09/how-to-hard-reset-blackberry-playbook.html
How to Hard Reset BLACKBERRY PlayBook to remove pattern lock and restore all setting to original settings. Take a backup of all the important files because hard reset will erase all your data.
- At the first step switch off the device.
- Afterwards press and hold the Volume Up + Volume Down + Power button for a short while.
- Wait to complete the whole operation.
- Hard reset is performed. Simple!