Reconnect the power adapter to the dock, then plug the USB-C cable back into your laptop.

Once the update initiates:

For the firmware update to succeed, your laptop needs the latest "hooks" to talk to the dock. Ensure these are updated in this order: (Latest version for your laptop). Intel Thunderbolt Controller Driver. Intel Graphics Driver. Step 3: Run the Firmware Utility Close all open programs.

Hold the dock's power button for to drain any remaining power.

Are you experiencing a during the update, or is the dock failing to recognize a second monitor ?