How to Install BlackBerry 6.0 OS On BlackBerry 4.x 5.x, 6.x Or 7.x
Install BlackBerry OS On BlackBerry Phone When Itís Not Available From Your Carrier

  1. First, make sure that you have installed the BlackBerry Desktop software on your computer, you can get it from here. After installation, use the Desktop software to make a backup of your device.
  2. Go here and select BlackBerry Model from the dropdown menu and click the Next button. Click the Download link for BlackBerry Handheld Software Fill out the required fields (you can enter anything for job title and company) and click the Next button. Scroll to the bottom of the page, select the Agree radio button and click the next button. Finally, click the Download button.
  3. Once the software has been downloaded, install it onto your computer.
  4. After the software has been installed, connect your BlackBerry to your computer using the USB cable.
  5. On your computer, go to C:\Program Files\Common Files\Research In Motion\AppLoader and delete vendor.xml. Staying in the AppLoader directory, double-click Loader.exe to install the OS onto your handheld device. After a few reboots, your BlackBerry will be running the BlackBerry X.X OS.