(Read, "How to Reload the Operating System on a Nuked Black Berry," if you ever find yourself with a bricked 'Berry.
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.
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Your OS version will be listed as a series of numbers after a lowercase V (v220.127.116.11) on the first screen.
You can also employ the Help Me screen shortcut to determine your current OS version by hitting ALT, SHIFT and the letter H.
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.
If you've got all the necessary tools listed above, the Black Berry OS install process should be a breeze. First things first, you'll want to download the new Black Berry OS and save it to your PC.
To determine what OS version you're currently running, click the Options icon on your Black Berry home screen and select About.
The software version will be listed on the General tab.
Black Berry Desktop Manager version 4.5 If you're not running Desktop Manager v4.5, visit RIM's site and download and install the latest version of the software.
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.