OS X 10.11.4 or better is required for Tessel USB support

[jverne]

Once Node.js and npm are installed to OS X, unless you are at 10.11.4 or better trying to enumerate Tessel 2 devices on USB will deadlock in the kernel.

(See here: https://forums.tessel.io/t/tessel-on-os-x-el-capitan/2298)

The node process will be stuck, and the CPU use for the kernel will spike to 100% and stay there. You will have to reboot the box to clear this up. Attempting to kill the locked node process just causes it to turn into a zombie process.

The kernel is spinning on something in the USB subsystem. I apologize for not getting the "sample" output these offending processes.

Over on the Tessel forums I was referred to this USB OS X issue which seems relevant.

Upgrading to 10.11.4 (which I was not automatically notified of, otherwise I probably would have already accepted it!) solve the problem and allowed me to enumerate and provision the Tessel device via t2.

[reconbot]

We actually require node 4x right now.