How to Update BIOS of Dell Inspiron with Linux Debian

• Download the update bios file (*.exe) from the Dell support site.
• Save it to /boot/efi
• Reboot the machine
• Push F12
• Choose Bios upgrade.

source https://www.dell.com/community/Linux-Developer-Systems/Update-bios-in-DELL-XPS-9360-laptop-running-ubuntu/m-p/6029222#M8388