The laptop must be plugged into a reliable power source. Updates will usually not run on battery power alone.
Updating the BIOS on your Dell XPS 13 9365 2-in-1 is a critical maintenance step that improves system stability, security, and hardware compatibility. Preparation Checklist Dell Xps 13 9365 Bios Update
If you use Windows encryption, suspend it in Control Panel before starting, or you may be locked out after the reboot. Method 1: The Easy Way (Dell SupportAssist) The laptop must be plugged into a reliable power source
If you have a Dell XPS 13 9365, make sure to check for BIOS updates regularly to keep your laptop running at its best. Dell Xps 13 9365 Bios Update