by Hard Reset
Before you buy a new cell phone or new tablet, please try the following procedure to repair your device. First charge your battery, backup your important data if possible and in most cases take out SIM and SD card before 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.!
Reset the BlackBerry 9700
Remove and reinsert the battery.
BlackBerry 9700 Bold Hard reset
Press: ALT + SHIFT + DEL
Format the device memory or a media card
If you format the BlackBerry® device memory or a media card, all the files in the device memory or on the media card are deleted.
Depending on your device model, you might not be able to format your device memory.
1. On the Home screen or in a folder, click the Options icon.
2. Click Memory.
3. Press the Menu key.
4. Click Format.
5. Complete the instructions on the screen.
Warning: All data on your phone will be deleted.