[villain]

I've got as far as trying to screen the device using "screen /dev/tty.usbmodem14301 115200" in terminal (I couldn't get PuTTY working) but it throws a quick error (something about resources being busy) then "Sorry, could not find a PTY." and returns to the previous terminal window.

I also tried to reinstall the firmware to the latest version, and I can no longer use the latest version of the Tangara Companion ("You can't open the application "Tangara Companion" because this application is not supported on this Mac." - I'm running MacOS Sonoma 14.6.1 on a 2018 Mac Mini) and flashing via the CLI doesn't work anymore either:

Code:

A fatal error occurred: Could not open /dev/tty.usbmodem14301, the port is busy or doesn't exist. 
([Errno 16] could not open port /dev/tty.usbmodem14301: [Errno 16] Resource busy: '/dev/tty.usbmodem14301')

I'm somewhat out of my depth here and am not sure what else to try to even get you useful diagnostic information.