Sonic Pad -> Prusa MK3S Firmware Update Failing  

Sonic Pad -> Prusa MK3S Firmware Update Failing

Hello! Just got a sonic pad for my prusa MK3S, and while following the set up instructions for the user defined model adaptation. My Prusa gets hung up on the initial firmware flashing, where the printer displays 'updating firmware' and the sonic pad displays 'done', however the sonic pad does not retain the printer as an option. I've tried a few different options with no success:

1. Changed out the USB A->B cable
2. Flash back to the latest Prusa firmware
3. Reset the sonic pad and start again
4. Replace the thumb drives, reset the printer.cfg file
5. Update the printer.cfg file in advance to the Prusa MK3S settings shown in the tutorial.
6. Waited for 2-3 hours after the sonic pad said the firware update was completed before making any changes

The printer still displayed 'updating firmware'. Curious if anyone has any other thoughts on things to try.