On May 8th Radsone delivered their 6th firmware update adding DFU support for macOS users (among other features). A welcome update indeed. Previous firmware updates were available only through a Windows PC.
The update instructions were not difficult, just a bit confusing. The update is run in Terminal and when I got stuck I emailed Radsone support for help. They got back to me with the solution a few hours later.
Thank you Radsone!
You can find the download at EarStudio by Radsone