I have just upgraded my bios from A06 to A09 and have had trouble since.

I have a Bluray burner and have copied my Bluray movies to my 2nd. hard drive, using Any Dvd BLURAY.

All was working perfectly before A09, but since upgrading I have sound but NOT PICTURE on my movies.

  Also my screen resolution is not working correctly.

How do I revert to A06 BIOS, as I can't find how to.   PLEASE HELP.  THANKS.

 

XPS M1730 Vista Ultimate

T9300@2.5GHz NVIDIA GEFORCE8700M GTx2

Bluray