On the home screen, swipe down from the top of the
screen.
Tap Settings > Security > Encryption.
Do any of the following:
Set the Device Encryption switch
to On.
Set the Media Card Encryption
switch to On.
CAUTION:
Try to decrypt or back up your encrypted media card files
before a security wipe, which is designed to delete your BlackBerry device data including the encryption key. You can't access
encrypted media card files without this encryption key.