Our Zumo 32U4 abruptly stopped connecting to our MacBook Pro (OS 13.3.6) via Arduino (1.8.7).
The Zumo powers on, but does not enter bootloader when plugged it. It will enter bootloader mode with two presses of the reset button. But this does not help:
I have tried reviving using both the Arduino IDE (9.1 support section) and with AVRDUDE (9.2 support section). With both, it is as if the Zumo is not plugged in.
The USB ports are still working, and I’ve tried multiple USB wires, so it’s not that. I’ve tried to do a clean install and configuration of Arduino on a different MacOS user, but this didn’t help. I saw this, but this didn’t help: Zumo 32U4 not detected via USB
We are fairly new users, but have loaded many programs into the Zumo before this.
Any thoughts?