OwlNest uses DFU to flash the device directly with a
.bin image. There's an option within the program to download an image from our server. If you select the latest from the list, which I think is probably v10, then that will be downloaded for you and you can flash it.
You will need v10 to then use OwlControl, the new software, to upgrade again to a newer version.
Basically you're fast-forwarding through 6 years of OWL development!
From v10 onwards the firmware itself first receives the flash update as MIDI sysex, verifies it against the checksum, then flashes the device. The advantages are both that we have a level of protection with the checksum, and that we can use MIDI instead of DFU as the upload link.
The latest devices we're shipping (Alchemist and Wizard) have a new USB MIDI bootloader.