Your carrier may ask you to login to download the software, so you might need to create an online account if you haven't already done so.
To do so, open your PC's Program Files App Loader and then delete the Vendor file, which is in XML format.
If you don't delete the other vendor's file, the software won't be able to install the software on your carrier-locked device.
With the official release of Black Berry OS v4.5 on the horizon—various beta, or test, versions of the software are already bouncing around the Web—we thought this would be a great time for a Black Berry OS tutorial.
What follows is our step-by-step guide on how to upgrade your Black Berry's OS, or install a different version, as well as how to prepare beforehand to make the process run as smoothly as possible.
After you've prepared for the changes that come along with a new Black Berry OS, you'll want to begin the installation process.
First, close all related applications and services on your PC and launch the file.
I also noticed that the color of my jazzy new Crack Berry launcher changed from orange to cyan…
It's a good idea to switch back to an official RIM theme if you're using a third-party option, at least at first, because some features of non-official themes won't work properly on the new OS.
You can visit Crackberry.com's OS4.5 Beta forum for discussion and help should you run into issues.