This will upgrade the firmware of a Sony DW-U10A DVD Burner to DW-500A 1.0g. Then you can get the most current update for the 500A from the Sony site. At thew time of posting this, the most current update is 2.0h.
This HAS been tested by me and it worked on a WinXP Pro machine. I hope it helps you too. I found it originally on a dutch site.
The following files are found inside the driver download file.
|10A to 500A [1.0g]/10A to 500A [1.0g].exe||1.1 MB||15 Mar 2003|
|10A to 500A [1.0g]/Sendcom.dll||49.2 KB||15 Aug 2002|
|10A to 500A [1.0g]/SENDCOM.vxd||9.8 KB||20 Apr 2001|