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How to update the blackberry curve 8520 
Scroll to and select " options " from the home screen of your blackberry curve 8520. 
Select " device, " then select " software updates. 
Follow the on-screen prompts to finish updating your software wirelessly.
When complete, your blackberry will be updated with the latest software. Update your blackberry using methods two or three in this article if you receive a message saying you are unable to update your blackberry wirelessly.