This happened to me and I did have a computer around, but I didn’t know about the bootloader reinstall option at that time and decided to make a spontaneous alternative setup that did not use the Duo.
I really like the Duo, especially the concept and all the possibilities. I’ve used it in my recent gigs and will continue to. However, having that incident and seeing the other reports has changed my outlook on the Duo a bit. I was a little more optimistic before that the Duo could be the brains of my operation - bringing together looping, instrument / vocal effects, and MIDI exchange that I could manage in pedalboard and preset collections. With the risk of hardware instability, and numerous usability shortcomings around what I’m trying to accomplish, I’m more focused now on setting up single-instrument or single-purpose pedalboards, with simpler layouts. I recently bought a Boss RC-300 loop station and a Beatbuddy, so now I can let the Duo shine as a powerful tool for generating nice sonic textures that I can then loop / record from. I’ll have the peace of mind that I could probably swap out the Duo with someone’s MultiFX pedal last minute and make it work well enough.