Some Dell owners have stated that their devices are having major boot problems after installing the latest BIOS updates. Particular models of Alienware, Inspiron and Latitude systems are affected. Many devices are displaying bluescreens and other errors.
https://www.notebookcheck.net/Some-Dell-systems-are-not-booting-due-to-BIOS-upgrades.588929.0.html
My company has run into this situation a few times. Some we worked out others we made a deal with owners.
(ECS) Engineering Computer Systems
Former Dell tech : The new Bios doesn't have a boot path all you have to do is create one