Having trouble updating the firmware on my new Presonus Quantum

I'm setting up my new Presonus Quantum interface. Things are going well so far, but I'm having problems updating the firmware. I'm ruing this coected to the Thunderbolt port on my MacBook Pro (Retina, 15-inch, Mid 2014), ruing Mac Sierra (10.12.6).

When I start the newly downloaded Universal Control, it prompts me to update the firmware. So, I click the Update Firmware button. Both the Universal Control and the Quantum itself show progress, like things are going fine. It competes the update. Then, I turned off the Quantum, unplugged the Thunderbolt cable from both the Quantum and from the Mac. I recoect the cable, start the Quantum, and then quit and restart Universal Control.

But then Universal Control comes up with the same message. PLEASE UPDATE DEVICE FIRMWARE!

It continues to say I'm ruing 0.8.49 and Version 1.1.0 is available.

I've tried this about five times now. What's the solution? I can't seem proceed until this is upated successfully.

Thanks,

PeterNH