No not ISO. I find most of these BIOS updates in DOS mode with .50 file extensions. Since this is an unknown file extension, would like to know what I should do to turn it into a ROM file. The files are found here http://www.asrock.com/mb/download.asp?Model=Wolfdale1333-D667
Please check them for yourself.
even the modded ones on the internet have a .50 extension. Am I missing something? Help!