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how do I revert from win 10 bld 10074 back to win 10 bld 10130
I was running win 10 bld 10130, but had no sound. Tried what I thought was everything to update the drivers, with no success. Finally reverted back to bld 10074. Still no sound, so I downloaded a driver program and it downloaded the needed new driver. Now I want to get back to 10130. It was saved as Windows.old. Used to be a way to revert to win.old but can't find it. Any help GREATLY appreciated.