How do I upgrade the OS on my device? Follow these instructions:
1. Download and install to PC the latest version of Desktop Manager from here: ( BlackBerry Operating System Downloads )
2. Download the new OS you want and install it to the PC
3. Open Desktop Manager and do a complete backup of your current device.
4. Delete the vendor.xml file located in c:\program files\common files\research in motion\apploader
5. Plug in BB and open Desktop Manager
6. Select Application Loader
7. You will be prompted to upgrade
http://www.blackberrycool.com/2010/01/12/how-to-upgrade-your-blackberry-os-software-2010-version/
http://www.blackberryfaq.com/index.php/How_do_I_upgrade_the_OS_on_my_BlackBerry%3F
***** Remember to turn pc internet off and delete vendor.xml
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