There have been reports that DCU is hanging, and unresponsive during BIOS updates. The update procedure does not complete. It is reported that the blue progress bar shows 100%, but nothing else happens.
Dell Engineering found that DCU waits for an exit code from the BIOS update. Which then prompts and waits for the password to be supplied. However, when a BIOS administrator password is configured for the computer, and the password is not set in the DCU application. Then the password is never supplied and the update hangs.
This application is working as expected, and this is covered in the user guide. As you can see from the Note box excerpt that I have included below:
To resolve this, simply ensure that if a BIOS administrator password is set on your personal computer. Ensure that the same password is entered into the DCU as well.