Computer went to "connected standby" while updating BIOS through Dell Update v3.0

Don't use any utility like Dell Update 3 or Support Assist to update the bios. If Dell tech support tells you need a bios update, go directly to Dell Downloads and get it yourself. Disable connected standby when installing updates and connect the power adapter. Power interruptions like that while updating the bios can brick your computer. Make sure you really need any bios update or just skip it. Laptops rarely need driver or bios updates. Sign up for Dell Notifications of updates at the download site. 

Were you able to use the computer after the rollback/cancel?