This is my first post here. So hello everyone! I am happy to become part of this great community.

I have a problem with my T4.0 not showing up as ttyACM.
I have multiple Teensy LCs and both a Teensy 4.0 and a Teensy 4.1 and running a Manjaro Linux machine.
When connecting the boards to USB they all correctly identify as "16c0:0486 Van Ooijen Technische Informatica Teensyduino RawHID" and the udev rules add the ttyACM.
But when I connect the T4.0 it identifies as "1fc9:0135 NXP Semiconductors SE Blank RT Family".

The only thing I did to the T4.0 was soldering the Audio Shield Rev D. But I didn't check the T4.0 before.
Could there be an issue with my soldering? Or is there an issue with the Teensy itself?

Thanks in advance
Konrad