How to reset my BlackBerry Bold 9900 4G to the factory default settings

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Follow these steps to safely reset and reboot your BlackBerry® smartphone.
1. Press and hold the alt key, the right aA key (shift/caps lock) and the del key at the same time.
2. The BlackBerry smartphone will shut down, and the keys can now be released.
3. When the BlackBerry smartphone has restarted the reset is complete.