/Add-Driver {/Driver: | /Driver: } /recurse /ForceUnsigned Adds drivers to an offline image. Use /recurse to query all subfolders ...

/Add-Driver {/Driver: | /Driver:} 
            [/recurse] [/ForceUnsigned]

  Adds drivers to an offline image. Use /recurse to query all subfolders for
  drivers. Use /ForceUnsigned to add unsigned drivers to X64-based images.
  This command is not supported against an online image.

    Examples:
      DISM.exe /Image:C:\test\offline /Add-Driver
        /Driver:D:\Drivers\Usb\Usb.inf

      DISM.exe /Image:C:\test\offline /Add-Driver /Driver:D:\Drivers /recurse