Complete BlackBerry Secrets Blog

Here is the procedure to upgrade the Blackberry ...

What you need :
1. Windows XP
2. BlackBerry Desktop Manager version 4.5

Procedure:

1. Download the installer OS Blackberry
just search it on the internet if you do not know where to download ...
keywords example : 8700 4.5.0.69
Then you'll get this kind of link :
https://www.blackberry.com/Downloads/entry.do?code=4C56FF4CE4AAF9573AA5DFF913DF997A
2. Install the files that you've downloaded from the link (Do not forget to turn off the Desktop Manager first)
3. Open the directory C: \ Program Files \ Common Files \ Research In Motion \ AppLoader
4. Delete Vendor.xml
5. Connect BlackBerry to the PC via USB
6. Turn on Desktop Manager
7. Click AppLoader
8. Then just follow the instruction for installing OS.

The whole process takes about an hour to finish.

Note: During the process, never unplug the Blackberry. If there is a failure, just restart from beginning ...