HOW TO UPGRADE BLACKBERRY 8520 OS?

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Download Latest Device OS 5 from this link

https://www.blackberry.com/Downloads/contactFormPreload.do?code=3210DDBEAA16948A702B6049B8D9A202&dl=BF6E4A9A68221FD3D51E9AD8D86CA87A

Step 1
Backup your device first, using Desktop Manager > Backup.
Close Desktop Manager upon completion.
Step 2

Download the OS file to the PC then install it to the PC by running (double clicking) the file you downloaded.

Step 3
Go to c:\program files\common files\research in motion\apploader and delete the file named “vendor.xml.”
Step 4
Plug in BlackBerry and double click on “Loader.exe.” It’s located in the same place as the above vendor.xml file.

After the Process,Please press done.

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