How do I restore BBM?
If you switch devices or lose your device, you can restore your BBM data by using the same BlackBerry ID that you associated with BBM. Your BBM contacts, profile, and channels are automatically backed up based on your BlackBerry ID. You can only sign in to BBM on one device at a time.
After restoring BBM, if you don't see all of your groups, you can ask someone from the group to invite you again.
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