Hey there,
as I said, the USB D- pin should definitely not have continuity to GND. I would try to find out where that comes from. As far as I am concerned (just checked the photographs again), the USB D+ and D- pins directly go into the SoC. So if one of those is really shorted out to GND it might be the SoC that is broken.
To be honest, I do not know what else is connected to D- trace on the board. Maybe someone else knows.
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