Don’t ever update the BIOS on a @Dell computer. When it bricks the motherboard (like it did mine), Dell will accept no liability if out of warranty. Seems like something their DellSupport system should mention when it prompts you to update. dell.com/community/Customer-…
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For anyone that finds yourself in this situation, I was able to get my XPS Desktop back to life by unplugging the power, removing the CMOS battery for 30 minutes, held the power button for 15 seconds, put the battery back in, then connected power and turned it on.
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I replaced the CMOS battery with a new one for good measure. Once it was booting again, restarting would then show it trying to do the Dell update via "Windows is preparing your update".

Oct 6, 2019 · 4:02 PM UTC

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To fix that problem, I hard powered off the desktop on the screen that said don't power off the computer (ha), booted it back up, went into DellSupport app, restored before the update, restarted, it again sat on the "Windows is preparing..". Hard powered it off, booted it up.
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Now when I logged in, the DellSupport app said the roll back couldn't be completed, so I chose "Cancel" and everything seems normal again.
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BTW, as you might have saw, Dell Support reached out via Twitter. They helped me by telling me that my warranty was expired and that I can contact their main support line. Pretty sure this is my last Dell purchase.
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