after flashing the latest (4.0.0 beta 2) firmware and loading 4.x libraries, I can see the trellis m4 as a storage device and can load/execute code on it, however I cannot see the device as a tty serial connection:

vjmorrison@penguin:~$ ls /dev/tty*
/dev/tty

vjmorrison@penguin:~$ python3 -m serial.tools.list_ports
no ports found

vjmorrison@penguin:~$ ls /dev
console fd initctl lxd net ptmx random stderr stdout urandom zero
core full log mqueue null pts shm stdin tty wl0

I attempted resets, different USB cables/ports but to no avail.

My chromebook is a Pixel Slate, running most recent updates.