To make this update not mandatory, disable capsule bios updates in the uefi menu. Bios updates have evolved to a way that they aren't as dangerous as before, but the risk still remains. For me it didn't brick, but my friend got the other end of the stick.
[IMAGE] This optional update became mandatory and I'm scared to turn off my laptop if it's a bios update. Help as quick as you can!
What is a "Dell, Inc. - Firmware 1.5.0.0" update?