You can use your BlackBerry smartphone when you download the BlackBerry Device Software but not while you install the software. During the installation process, your smartphone might reset or display a white screen. Do not remove the battery while the update is in progress.
If encryption is turned on, you might need to type your password at various times during the installation process.
Research In Motion recommends that you regularly create and save a backup file on your computer, especially before you update any software. Maintaining a current backup file on your computer might allow you to recover smartphone data if your smartphone is lost, stolen, or corrupted by an unforeseen issue.
If you updated your software over the wireless network, to delete the previous version of software that is temporarily stored on your smartphone, on the home screen or in a folder, click the Options icon. Click Device > Software Updates. Press the key > View Result. Press the key > Delete Downgrade Data.