How To Upgrade And Install Software BackBerry OS :
Install the BlackBerry ™ Desktop Software (CD) on your PC which is usually contained in the box your device. Or you can also download the latest version of it from http://us.blackberry.com/support/software/desktop.jsp then reboot your PC.
The next step download BlackBerry™ OS file that suitable to type of your BlackBerry™. You can download official OS that match your Service Provider from the link below:
http://us.blackberry.com/support/downloads/download_sites.jsp
After you have successfully downloaded the BlackBerry™ OS file that match your device and then install the file to your PC. Then reboot your PC.
If you install the OS file from the service provider that is not the same as the service provider you use, then you must...