You should regularly create and save a device backup file on your computer, especially
before you update any device software. Maintaining a current backup file on your
computer might allow you to recover device data if your BlackBerry device is
lost, stolen, or corrupted by an unforeseen issue.
On the home screen, swipe down from the top of the
Settings > Software Updates.
Tap Check for Updates.
You can also update your device software using BlackBerry
Link. For more information, see the Help documentation for BlackBerry