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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.

To do so, open your PC's Program Files > Common Files > Research In Motion > AppLoader and then delete the Vendor file, which is in XML format. If you do decide to install unofficial software and it's from a carrier that isn't your own, you should be sure to ditch the software's vendor XML file before beginning installation. (Read, " How to Reload the Operating System on a Nuked BlackBerry," if you ever find yourself with a bricked 'Berry. Beta operating systems are not officially released for good reason: They're often full of bugs and could potentially void your warranty or worse, render your BlackBerry unusable. If you decide to download and install an unofficial version of the BlackBerry OS, you should beware that you're doing so at your own risk. Save the latest BBOS onto your Windows-powered computer If you've got all the necessary tools listed above, the BlackBerry OS install process should be a breeze. Mac users beware: RIM doesn't currently offer the BlackBerry Desktop Manager software for Apple computers however, industrious Mac owners running Parallels and who have a copy of Windows have been able to upgrade their BlackBerrys via Macs, though the process can be a bit clumsy. To start a new operating system install, you'll need your BlackBerry, an Internet-connected PC, a USB cable and about an hour and half of free time-50 minutes or an hour for the upgrade process and 30 minutes or catch-up time afterwards. What follows is our step-by-step guide on how to upgrade your BlackBerry's OS, or install a different version, as well as how to prepare beforehand to make the process run as smoothly as possible. With the official release of BlackBerry 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 BlackBerry OS tutorial.

Keeping up to date with the newest operating system (OS) software for your smartphone ensures that you have access to all the latest and greatest features and performance tweaks. Research In Motion (RIM) is constantly developing and testing new software and applications for your BlackBerry.