Yeah, can't tell much from those logs, which is not terribly surprising if you have to hard-reboot

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@jhh: Are you also still on the factory FW?
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It might very well be a factory FW quirk, or not, but unfortunately, yeah, I think shell access will be necessary to get to the bottom of this

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(IIRC, USBNetwork should silently supplant the builtin factory USBNet handling).