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RE: XPS 9550: Latest Thunderbolt firmware upgrade destroys HDMI port

This firmware update rendered one of our XPS 15 9550 laptops unbootable.  The update progress bar reached 100% and prompted for a restart.  I clicked OK and the computer never booted again.  It gets pas POST and the Dell logo but hangs at either a black screen or on the Windows logo with no progress.  Onboard Diagnostics still work and show no errors but I can't boot from USB or from the internal NVMe drive.

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