hd51-tests/ax51_mutant51_BS-DDT-rev1882_HAL-rev1612_NMP-rev13020_NewLayout_swap_multi_usb.zip & multi_usb.zip & ofg tgz _22.04.2020
I do not own the device, but I brought the version for someone who would like to try, so I couldn't help anyone with the setup problems.
Download page
http://dual.franken.bplaced.de/