Dell XPS 8500 (Early 2012) - Manual (Page 134)

6 Click Save to save the file on your desktop. The file downloads to your
desktop.
7 Click Close if the Download Complete window appears.
The file icon appears on your desktop and is titled the same as the
downloaded BIOS update file.
8 Double-click the file icon on the desktop and follow the instructions on
the screen.
Flashing the BIOS 134