Darwin OP Upgrade and Modernization
From Lofaro Lab Wiki
Configuration
Fix CM730 USB-Serial connection issue
By default the FitPC2i will use brltty when running Debian 11. This will cause the CM730's USB connection to be disabled. Run the following to disable briltty.
sudo systemctl mask brltty.path
Then reboot
sudo reboot
Now the CM730 should show up as /dev/ttyUSB0