Windows 10 BIOS Update frozen

Hey guys. I think I really messed something up. I have a Dell Inspiron 15. Got it about 3 months ago. I just sat on the phone with dell a couple of days ago for 4 hours while they fixed it and now when I went to do the BIOS Update it is frozen. The Dell Tech guy said that everything would be backing up automatically but I guess that's not the case. How do I shut it down? CTRL, ALT, DEL? Will I screw it up than I already have? AmI really this tech illiterate?