I can't seem to update my CBT's firmware on my Ubuntu machine. I've tried both the alpha app, as well as through the Arduino sketch, with no luck. The LED on my CBT goes from flashing red slowly, then flashing red quickly, then just green but that alpha app stays on the flashing in progress screen. If I try updating through Arduino, I get "avrdude: ser_open(): can't open device "/dev/ttyACM0": Permission denied
avrdude: ser_send(): write error: Bad file descriptor". I've done some searching for this error on Arduino as a whole and have seen some issues related to USB 3.0. Unfortunately my laptop only has 2 USB ports, and they're both 3.0 ports.

Any thoughts?

It could be a permissions issue. Try adding yourself to the group that owns the port:
<code>
sudo usermod -a -G dialout [username]
sudo chmod a+rw /dev/ttyACM0
</code>
Then log out and back in.<blockquote></blockquote>

Doesn't seem to do it. Thanks for the suggestion tho. Any other thoughts?