Posted by bluefairy1971 in another thread......very concise:
Instructions for updating your BlackBerry OS
This could take anywhere from 30-60 minutes.
- Make sure you have the latest version of Desktop Manager 4.3 installed.
- Download the latest OS for your BlackBerry model to the PC then install it to the PC by running the file you downloaded.
- Go to \Program Files\Common Files\Research in Motion\AppLoader and DELETE the Vendor.xml file.
- Plug in your BlackBerry via USB and Open Desktop Manager. You should be prompted to upgrade.