BlackBerry 8700 hard reset: In the device options, click Security Options...

BlackBerry 8800 hard reset: In the device options, click Security Options...

BlackBerry 8820 hard reset: In the device options, click Security Options...

BlackBerry 8520 hard reset: In the device options, click Security Options...

Solved: How to hard reset BlackBerry 9700 Bold: Press ALT + SHIFT + DEL...

Solved: How to hard reset BlackBerry 9800 Bold: From menu select Menu key > Options > Security Options > Security Wipe...

Solved: How to hard reset BlackBerry 9780 Bold: Try this Press left ALT+...

Solved: How to hard reset BlackBerry Playbook tablet: hold the Power button for 10 seconds

Solved: How to hard reset BlackBerry 9360 Apollo:

Solved: How to hard reset BlackBerry Monaco Storm 3: On the home screen or in a folder, click the Options icon. Click Security > Security Wipe.

Solved: How to hard reset BlackBerry Torch 2: From menu select Menu key > Options > Security Options > Security Wipe...

Solved: How to hard reset BlackBerry 9520 Storm 2: From menu select Menu key > Options > Security Options > Security Wipe...

Solved: How to hard reset BlackBerry 9530: From menu select Menu key > Options > Security Options > Security Wipe...

Solved: How to hard reset BlackBerry 9800 Bold Touch: From menu select Menu key > Options > Security Options > Security Wipe...

General advice: Before you buy a new cell phone or new tablet, please try the following procedure to repair your device in a software way. First charge your battery, backup your important data if possible and in most cases take out SIM and SD card before doing 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.! Please also note, that a hard reset operation will not unlock your mobile phone's SIM lock or network lock, but it will remove the unlock pattern, remove the user password or PIN password (NOT the SIM card's 4 digit PIN code). Also note that the firmware version will not be affected in any way, it will not be downgraded, it will remain the same you are using and if you have rooted your device, root privileges remain also unaffected.