Turn on automatic updates for your device software
When a software update for your BlackBerry device is available and your device is connected to a Wi-Fi network, software
updates are automatically downloaded and installed on your device. When this feature is turned on, you aren't notified
when an update starts installing, but you may be asked to restart your device to complete the installation.
On the home screen, swipe down from the top of the screen.
Settings > Software Updates.
Turn on the Automatically Download and Install Software Updates switch.