Answer:
For updating sony DVD writer firmware you need to first know the model of your DVD writer. You can check on the cover of the writer or you can check it in Nero. Nowadays there are other softwares to get the system information. Once you know the model go to this site http://sony.storagesupport.com/models/21 there you can select your model and download the required firmware. Just go through the instructions. All you need to do it to run the program once then the firware will be updated.