Probably not going to be much help, but...
The log makes it look like the device is being seen but not mounted properly. I can see to cycles of the same messages, and "spitting a whole lot of this", so it is probably continuously retrying to connect to the device.
The questions that come to mind are:
- Do the other devices connect? Especially the Kobo devices.
- Do you have a non-Mac computer you can try?
- Was there a recent update on the Macs?
Unfortunately, I suspect you will to have to do a factory reset.
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