Some Blackberry OS version may have performance issue with PrivateWave and sometimes a firmware downgrade is required.

This is the step-to-step procedure

  1. Go to Blackberry Download site and select the right Mobile Operator and then the right device model.
  2. Follow the download procedure and download the firmware file
  3. Install the file on a Windows machine (MacOSX and Linux OS is not supported by RIM)
  4. Open Blackberry Desktop Software and connect the device
  5. Once the device is detected, open the Device menu and select "Update"
  6. A popup windows is shown with a message like "No update available for Blackberry Device Software"
  7. Select "Show other versions" in the bottom-left of the popup.
  8. Select the right version number and click install
The downgrade procedure will starts.
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