I think it is possible for an average consumer to install latest OS on his device once it is available for Nokia Care units. We have not yet tried this tool with our devices, be cautious before trying with your own device. Download Nokia Software Recovery Toolfor free. via:WPDUSource:
It seems Nokia has recently released a tool called Nokia Software Recovery Tool that will allow you to do the same. Using the Nokia Software Recovery Tool, you can recover your phone if you have software or software update problems. If your phone is not responding, it appears to be ...