I'm sorry you had trouble doing the firmware update. I'm glad you found the solution.
Thanks for the warning. I'm sure others will find this helpful.
If you use a PC or Mac you can go to the Bose Device Updater site at http://btu.bose.com to update your S1 Pro system. Follow the prompts on the screen and you will be asked to connect your S1 Pro system to the computer using a USB cable.
If the Bose Device Updater does not recognize your S1 Pro system, then try a different cable.