My Latitude 5401 went to update the Thunderbolt 3 Firmware and it locked the laptop up. Had to do a hard shutdown.
Laptop on reboot did a disk repair on C: and then on reboot I noticed that my thunderbolt dock is no longer connecting.
I tried running the firmware update manually by downloading it from DELL website and that locked up laptop right away. Tried the previous version and same result.
Maybe some kind person could provide some steps to diagnose and repair this.
I am seeing this same issue on Windows 10 v1903 with the latest patches installed. Tested on my 7540 and two 7400s. Also running the TB16 dock firmware updater causes the same issue.
I have seen this on 3 Latitude 5501 laptops so far, with Windows 10 v1909. As soon as the update launches the system freezes, not able to use mouse or Ctrl+Alt+Del. The fans rev up but nothing happens. Have had to hold the power button down to shut the system off. The drivers section on the Dell support site say this is an Urgent update. I have tried different user profiles, domain and local, and tried Run as administrator, all lock the system up.