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. 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.