directly from blackberry web site, in the section support downloads, there are actualized software, and you most download firs the 4. 3 version, then you install, after that you download the 4.5 version install these.
After all that you have to conect you BB and starts the sync process. You desktop manager tells a message that you device doesn't have the apropiate software, so then you can update you BB following the steps in you PC.
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