If you own BlackBerry Bold 9900 Dakota series, you may upgrade your Blackberry OS to this new version. Here we provide the download link for Blackberry OS version 7.1.0.649 available for Bold 9900 series. To download, visit this website and press Download button. In order to download this Blackberry OS 7.1 you must register yourself first. Its free. We do not provide the tutorial how to upgrade Blackberry Bold 9900 with this Blackberry OS 7.1.0.649.