How to reset my BlackBerry Curve 9300 to the factory default settings

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If you're having trouble with your BlackBerry® smartphone, you can perform a soft reset to safely reboot the BlackBerry smartphone. This type of reset does not delete any settings or data.
1. Press and hold the Alt, right Shift and Delete keys at the same time.
2. The BlackBerry smartphone will shut down, and the keys can now be released.
3. The BlackBerry smartphone will restart.