1. Install BlackBerry Desktop Manager onto your computer.
2. Download the latest 8707g firmware by clicking
HERE.
3. Run the Firmware Installer that you downloaded on your computer.
4. Open BlackBerry Desktop Manager
5. Connect your BlackBerry device via USB
6. From BlackBerry Manager select "Application Loader"
7. Once App Loader opens it should detect your device, if this fails restart your BlackBerry whilst it is still connected via USB and retry.
8. Once App Loader detects your device it will display a list of upgradable or changeable items which you can customize. For now leave these options as default.
9. Continue the wizard and your device will be updated and will eventually reboot. This reboot can take up to 10 minutes.