bleepingcomputer[.]com/news/technology/new-dell-bios-updates-cause-laptops-and-desktops-not-to-boot/
Based On User Reports: "Impacted models include Dell Latitude laptops (5320 and 5520), as well as Dell Inspiron 5680 and Alienware Aurora R8 desktops." There could be more models effected. The devices apparently are not completely bricked -- you can flash the BIOS with an older version to get them back working, *assuming* you have a means to get online and download that older version etc. The best option of course is to not allow any BIOS updates on Dell hardware until this is resolved.